{"id":2579,"date":"2023-11-27T14:50:58","date_gmt":"2023-11-27T14:50:58","guid":{"rendered":"https:\/\/www.altman.cz\/magazin\/?p=2579"},"modified":"2023-11-27T14:51:00","modified_gmt":"2023-11-27T14:51:00","slug":"sperky-s-povrchovou-upravou","status":"publish","type":"post","link":"https:\/\/www.altman.cz\/magazin\/p\/sperky-s-povrchovou-upravou","title":{"rendered":"\u0160perky s povrchovou \u00fapravou"},"content":{"rendered":"\n<p><em>Co rozum\u011bt pod term\u00ednem \u201eb\u00edl\u00e9 zlato\u201c? Zlato je v\u017edy \u017elut\u00e9. Neexistuje \u017e\u00e1dn\u00e9 \u010derven\u00e9, b\u00edl\u00e9, nebo r\u016f\u017eov\u00e9 zlato. Jsou ov\u0161em slitiny tohoto kovu, kter\u00e9 vlivem barv\u00edc\u00edch p\u0159\u00edm\u011bs\u00ed nab\u00fdvaj\u00ed r\u016fznou barvu. Tuto skute\u010dnost nen\u00ed t\u0159eba rozv\u00e1d\u011bt, proto\u017ee je zn\u00e1ma zlatn\u00edk\u016fm oded\u00e1vna.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized has-custom-border is-style-rounded\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny-1024x683.jpg\" alt=\"\" class=\"wp-image-2580\" style=\"border-style:none;border-width:0px\" width=\"768\" height=\"512\" srcset=\"https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny-1024x683.jpg 1024w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny-300x200.jpg 300w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny-768x512.jpg 768w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny-1536x1024.jpg 1536w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny-2048x1365.jpg 2048w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<p>K tradi\u010dn\u00edm barv\u00e1m zlat\u00fdch slitin, ovlivn\u011bn\u00fdm pom\u011brem leguj\u00edc\u00edch p\u0159\u00edsad st\u0159\u00edbra a m\u011bdi, p\u0159ibyla v pr\u016fb\u011bhu devaten\u00e1ct\u00e9ho stolet\u00ed b\u00edl\u00e1. V\u00fdsledn\u00e1 barva zvolen\u00e9 slitiny byla ovlivn\u011bna zejm\u00e9na m\u00f3dou. Pokud se hovo\u0159\u00ed o b\u00edl\u00e9m zlat\u011b, a\u017e doned\u00e1vna se pod t\u00edmto term\u00ednem rozum\u011bla slitina s niklem nebo palladiem. Tyto kovy se t\u00e9\u017e ozna\u010dovaly jako \u201eb\u011bl\u00edc\u00ed\u201c a v\u00fdrazn\u011b ovliv\u0148uj\u00ed barvu v\u00fdsledn\u00e9 slitiny. V\u00fdsledn\u00e1 barva se pohybuje od stupn\u011b \u201epremium\u201c, p\u0159es \u201estandard\u201c po \u201eoff-white (na\u0161edl\u00e9)\u201c. Dippald Manchanda, technick\u00fd \u0159editel Puncovn\u00edho \u00fa\u0159adu v Birminghamu, popisuje vliv b\u011bl\u00edc\u00edch p\u0159\u00edm\u011bs\u00ed podle ryzosti slitin, vych\u00e1zeje z ASTM (American Standard Testing Methods) D1925:<\/p>\n\n\n\n<p><strong>9 kar\u00e1t\u016f:<\/strong><br>Premium white \u2013 375\/1000 Au a alespo\u0148 62\/1000 Ag<br>Standard white \u2013 375\/1000 AU a alespo\u0148 45\/1000 Ag, zbytek ostatn\u00ed leguj\u00edc\u00ed prvky, 1% st\u0159\u00edbra z hlediska b\u011bl\u00edc\u00edho efektu je ekvivaletn\u00ed 1% zinku, 0,6% niklu nebo 0,6% palladia<\/p>\n\n\n\n<p><strong>14 kar\u00e1t\u016f:<\/strong><br>Premium white \u2013 585\/1000 Au a alespo\u0148 265\/1000 b\u011bl\u00edc\u00edho kovu (z toho 165\/1000 prim\u00e1rn\u00edho, tj. Ni nebo Pd nebo sm\u011bsi obou)<br>Standard white \u2013 585\/1000 Au a alespo\u0148 225\/1000 b\u011bl\u00edc\u00edho kovu (z toho 120\/1000 prim\u00e1rn\u00edho, tj. Ni nebo Pd nebo sm\u011bsi obou)<\/p>\n\n\n\n<p><strong>18 kar\u00e1t\u016f:<\/strong><br>Premium white \u2013 750\/1000 Au a alespo\u0148 175\/1000 b\u011bl\u00edc\u00edho kovu (z toho 135\/1000 prim\u00e1rn\u00edho, tj. Ni nebo Pd nebo sm\u011bsi obou) nebo 750\/1000 Au a alespo\u0148 245\/1000 b\u011bl\u00edc\u00edho kovu (z toho 140\/1000 prim\u00e1rn\u00edho, tj Ni nebo Pd nebo sm\u011bsi obou)<br>Standard white \u2013 750\/1000 Au a alespo\u0148 195\/1000 prim\u00e1rn\u00edho, tj. Ni nebo Pd nebo sm\u011bsi obou)<\/p>\n\n\n\n<p><strong>22 kar\u00e1t\u016f:<\/strong><br>nelze b\u011blit<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized is-style-rounded\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny2-1-1024x683.jpg\" alt=\"\" class=\"wp-image-2582\" width=\"768\" height=\"512\" srcset=\"https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny2-1-1024x683.jpg 1024w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny2-1-300x200.jpg 300w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny2-1-768x512.jpg 768w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny2-1-1536x1024.jpg 1536w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/prsteny2-1-2048x1365.jpg 2048w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<p>Dva hlavn\u00ed typy b\u00edl\u00e9ho zlata, kter\u00e9 se vyskytuj\u00ed na trhu u\u017e\u00edvaj\u00ed k z\u00edsk\u00e1n\u00ed b\u00edl\u00e9 barvy palladium, nikl nebo sm\u011bs obou.<br>V sou\u010dasn\u00e9 dob\u011b je nikl sou\u010d\u00e1st\u00ed v\u011bt\u0161iny b\u00edlozlat\u00fdch slitin. Tyto slitiny obsahuj\u00ed r\u016fzn\u00e9 mno\u017estv\u00ed dal\u0161\u00edch kov\u016f, kter\u00e9 maj\u00ed ovlivnit jejich mechanick\u00e9 vlastnosti.<br>Bylo zji\u0161t\u011bno, \u017ee nikl vyvol\u00e1v\u00e1 u 5% populace alergickou reakci. Od roku 1985, kdy \u0160v\u00e9dov\u00e9 Larsson-Stymne a Wildstrom popsali n\u00e1dory na u\u0161\u00edch \u0161kola\u010dek, vyvolan\u00e9 alergickou reakc\u00ed, m\u016f\u017eeme sledovat silnou kampa\u0148 proti jeho pou\u017e\u00edv\u00e1n\u00ed. Jak u\u017e je zvykem, medi\u00e1ln\u00ed boj proti niklu se vede v\u0161eobecn\u011b, argumentuje se v\u00edce slovn\u011b a psychologicky ne\u017e v\u011bcn\u011b. V n\u011bkter\u00fdch zem\u00edch je pou\u017e\u00edv\u00e1n\u00ed niklu pro p\u0159edm\u011bty, kter\u00e9 p\u0159ich\u00e1zej\u00ed do styku s poko\u017ekou, zcela zak\u00e1z\u00e1no, jinde je podm\u00edn\u011bno zkou\u0161kou na ot\u011br niklu. Jsou veden\u00ed kompeten\u010dn\u00ed spory o zp\u016fsobech kontroly.<\/p>\n\n\n\n<p>Evropsk\u00fd parlament p\u0159ijal 30. \u010dervna 1994 Sm\u011brnici 97\/27 EC, kter\u00e1 byla uve\u0159ejn\u011bna 22. \u010dervence 1994 v \u201eofici\u00e1ln\u00edm \u010dasopise Evropsk\u00e9ho spole\u010denstv\u00ed\u201c. Touto sm\u011brnic\u00ed jsou zav\u00e1z\u00e1n zem\u011b EU omezovat pou\u017eit\u00ed niklu a p\u0159ipravit jednotn\u00e9 metody kontroln\u00edho m\u011b\u0159en\u00ed. Takzvan\u00e1 \u201eNiklov\u00e1 sm\u011brnice\u201c, publikovan\u00e1 v roce 1999, kter\u00e1 vze\u0161la z jedn\u00e1n\u00ed ustaven\u00e9 pracovn\u00ed skupiny, obsahuje 3 body:<\/p>\n\n\n\n<p><strong>1.<\/strong> Sou\u010d\u00e1stky v\u00fdrobk\u016f. Kter\u00e9 proch\u00e1zej\u00ed u\u0161n\u00edmi boltci a jin\u00fdmi prop\u00edchnut\u00fdmi \u010d\u00e1stmi lidsk\u00e9ho t\u011bla, nesm\u011bj\u00ed obsahovat v\u00edce ne\u017e 0,050 niklu.<\/p>\n\n\n\n<p><strong>2.<\/strong> Produkty, kter\u00e9 jsou v p\u0159\u00edm\u00e9m dlouhodob\u00e9m stylu s poko\u017ekou, nesm\u011bj\u00ed m\u00edt v\u011bt\u0161\u00ed ot\u011br 0,5 ng Ni\/cm<sup>2 <\/sup>\/t\u00fdden. Sem pat\u0159\u00ed n\u00e1u\u0161nice, n\u00e1hrdeln\u00edky, \u0159et\u00edzky, n\u00e1kotn\u00edky, prsteny, pouzdra n\u00e1ramkov\u00fdch hodinek, p\u00e1sky hodinek a sponky.<\/p>\n\n\n\n<p><strong>3.<\/strong> Pokud p\u0159edm\u011bty, uveden\u00e9 v bod\u011b 2. jsou pokoveny, ale pod povrchovou vrstvou je nikl, niklov\u00e1 slitina nebo niklov\u00e1 mezivrstva, pak test na ot\u011br mus\u00ed b\u00fdt pod uvedenou hodnotou i po dvoulet\u00e9m st\u00e1l\u00e9m pou\u017e\u00edv\u00e1n\u00ed, kter\u00e9 se p\u0159i zkou\u0161ce simuluje um\u011ble.<\/p>\n\n\n\n<p>Obavy z alergie na nikl a finan\u010dn\u00edch n\u00e1sledk\u016f pro v\u00fdrobce vedou k tomu, \u017ee se od pou\u017e\u00edv\u00e1n\u00ed tohoto kovu postupn\u011b upou\u0161t\u00ed, i kdy\u017e nebyl zji\u0161t\u011bn ani jeden p\u0159\u00edpad alergie, vyvolan\u00e9 slitinou b\u00edl\u00e9ho zlata s obsahem pod 5% niklu. Pr\u00e1vn\u00ed p\u0159edpisy \u0159ady zem\u00ed omezuj\u00ed jeho pou\u017eit\u00ed u v\u00fdrobk\u016f, kter\u00e9 p\u0159ich\u00e1zej\u00ed ve styk s poko\u017ekou. Proto je vyv\u00edjen tlak na v\u00fdvoj bezniklov\u00fdch slitin b\u00edl\u00e9ho zlata, kter\u00e9 jsou p\u0159izp\u016fsobeny po\u017eadavk\u016fm zpracovatel\u016f. P\u0159i rozhodov\u00e1n\u00ed o slo\u017een\u00ed b\u00edlozlat\u00fdch slitin vstupuj\u00ed krom\u011b technologick\u00fdch parametr\u016f do hry i dal\u0161\u00ed faktory. Pro vylou\u010den\u00ed niklu, kter\u00fd je vyv\u00edjen tak zejm\u00e9na ze strany hygienik\u016f, kte\u0159\u00ed s poukazem na niklovou alergii cht\u011bj\u00ed pou\u017e\u00edv\u00e1n\u00ed tohoto kovu zcela odstranit. P\u0159ibli\u017en\u011b u 10% \u017een a 2% mu\u017e\u016f se projevuje alergick\u00e1 reakce poko\u017eky na \u010d\u00e1stech, kter\u00e9 p\u0159ijdou do styku se slitinami obsahem niklu. K vyvol\u00e1n\u00ed alergick\u00e9 reakce doch\u00e1z\u00ed v\u00fdznamn\u00fdm p\u016fsoben\u00edm alergogenn\u00edch prvk\u016f. P\u0159i dotyku s niklovou slitinou jsou nejv\u00edce ohro\u017eeny jizvy po prop\u00edchnut\u00ed u\u0161n\u00edch lal\u016f\u010dk\u016f. U citliv\u00fdch osob m\u016f\u017ee b\u00fdt slitinami niklu z prsten\u016f, knofl\u00edk\u016f na kalhot\u00e1ch nebo b\u00edlozlat\u00fdch \u0161perk\u016f vyvol\u00e1na alergie i na jin\u00fdch \u010d\u00e1stech t\u011bla. Je t\u0159eba podotknout, \u017ee citlivost z\u00e1vis\u00ed hlavn\u011b na povaze slitiny a \u017ee nen\u00ed mo\u017eno ur\u010dit p\u0159ijateln\u00fd limitn\u00ed obsah. Zku\u0161enosti ukazuj\u00ed, \u017ee obsah niklu pod 2% ve Slitin\u00e1ch b\u00edl\u00e9ho zlata nem\u00e1 na citliv\u00e9 osoby prakticky \u017e\u00e1dn\u00fd \u00fa\u010dinek, zat\u00edmco obsahy nad 5% \u010dasto vyvol\u00e1vaj\u00ed pot\u00ed\u017ee. Legislativa u n\u011bkter\u00fdch zem\u00ed zak\u00e1zala pou\u017e\u00edv\u00e1n\u00ed niklu u p\u0159edm\u011bt\u016f, kter\u00e9 p\u0159ijdou do styku s poko\u017ekou t\u00edm, \u017ee zakazuje prodej nebo vy\u017eaduje ozna\u010den\u00ed u p\u0159edm\u011bt\u016f, kter\u00e9 poskytuj\u00ed v\u00edce ne\u017e 0,5 ng\/cm<sup>2<\/sup>\/t\u00fdden dimethylglyoximov\u00fdm testem k vytv\u00e1\u0159en\u00ed psychick\u00e9 bari\u00e9ry napom\u00e1haj\u00ed t\u00e9\u017e dne\u0161n\u00ed snahy o ozdraven\u00ed \u017eivotn\u00edho prost\u0159ed\u00ed a omezen\u00ed v\u0161ech negativn\u00edch vliv\u016f.<\/p>\n\n\n\n<p>Palladium, kter\u00e9 nejl\u00e9pe nahrad\u00ed nikl zvy\u0161uje bod t\u00e1n\u00ed slitin, nav\u00edc vzhledem k dramatick\u00e9mu zv\u00fd\u0161en\u00ed ceny vede i k vy\u0161\u0161\u00ed cen\u011b v\u00fdsledn\u00e9 slitiny. Proto jsou hled\u00e1ny dal\u0161\u00ed mo\u017enosti z\u00edsk\u00e1n\u00ed b\u00edl\u00e9 barvy slitiny zejm\u00e9na p\u0159\u00edsadou manganu a \u017eeleza. Nov\u00e9 slitiny nar\u00e1\u017eej\u00ed nejen na technick\u00e9 probl\u00e9my, spojen\u00e9 s zaru\u010den\u00edm po\u017eadovan\u00fdch vlastnost\u00ed, ale i na zna\u010dn\u00fd konzervatismus zpracovatel\u016f. Aby se nahradil nikl, je nutno naj\u00edt prvek nebo prvky, kter\u00e9 mohou b\u00fdt p\u0159im\u00edseny v dostate\u010dn\u00e9m mno\u017estv\u00ed aby vyvolaly b\u011bl\u00edc\u00ed efekt obdobn\u00fd niklu p\u0159i zachov\u00e1n\u00ed odpov\u00eddaj\u00edc\u00edch mechanick\u00fdch a fyzik\u00e1ln\u00edch vlastnost\u00ed. Seznam takov\u00fdch b\u011bl\u00edc\u00edch prvk\u016f, kter\u00e9 by mohly nahradit nikl byl pops\u00e1n O\u2019Connorem. Jsou to <strong>st\u0159\u00edbro, palladium, platina, kobalt, chrom, indium, c\u00edn, zinek, hlin\u00edk, titan, vanad, tantal, niob, \u017eelezo a mangan<\/strong>. P\u0159i srovn\u00e1n\u00ed vlivu t\u011bchto prvk\u016f bylo zji\u0161t\u011bno, \u017ee z hlediska schopnosti vyb\u011blov\u00e1n\u00ed jsou nejzaj\u00edmav\u011bj\u0161\u00ed \u017eelezo a mangan. P\u0159i nahrazen\u00ed niklu \u017eelezem ve slitin\u011b obsahuj\u00edc\u00ed alespo\u0148 10 % Pd, p\u0159\u00eddavek 2-5% Fe m\u00e1 zaj\u00edmav\u00e9 mechanick\u00e9 a barevn\u00e9 vlastnosti. U 14kar\u00e1tov\u00fdch slitin, kter\u00e9 obsahuj\u00edc\u00ed ni\u017e\u0161\u00ed pod\u00edl zlata je p\u0159\u00eddavek \u017eeleza problemati\u010dt\u011bj\u0161\u00ed ne\u017e u slitin 18kar\u00e1tov\u00fdch. Normandeau zjistil, \u017ee slitina, obsahuj\u00edc\u00ed 180\/1000 \u017eeleza, 86\/1000 palladia a 152\/1000 m\u011bdi je charakterizov\u00e1na velkou tvrdost\u00ed (232 HV), obt\u00ed\u017enou zpracovatelnost\u00ed a tmav\u011b \u0161edou barvou, zat\u00edmco zv\u00fd\u0161en\u00ed obsahu palladia na 167\/1000 a sn\u00ed\u017een\u00ed obsahu \u017eeleza na 42\/1000 poskytne slitinu vyhovuj\u00edc\u00ed barvy bez v\u00fdznamn\u00e9ho zhor\u0161en\u00ed zpracovatelnosti.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Pokovov\u00e1n\u00ed \u0161perk\u016f rhodiem<\/strong><\/h2>\n\n\n\n<p><em>Posledn\u00ed dobou je \u010dasto dosahov\u00e1n optick\u00fd efekt pokoven\u00edm \u0161perku rhodiem. Tento kov je v\u00fdrazn\u011b b\u00edl\u00fd, d\u00e1v\u00e1 leskl\u00fd povrch ji\u017e p\u0159i vytvo\u0159en\u00ed tenk\u00e9 vrstvy.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized has-custom-border is-style-rounded\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/making-1024x683.jpg\" alt=\"\" class=\"wp-image-2583\" style=\"border-style:none;border-width:0px\" width=\"768\" height=\"512\" srcset=\"https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/making-1024x683.jpg 1024w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/making-300x200.jpg 300w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/making-768x512.jpg 768w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/making-1536x1024.jpg 1536w, https:\/\/www.altman.cz\/magazin\/wp-content\/uploads\/2023\/11\/making-2048x1365.jpg 2048w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<p>P\u0159i povrchov\u00e9 \u00faprav\u011b st\u0159\u00edbra je povrch \u0161perku chr\u00e1n\u011bn p\u0159ed atmosf\u00e9rick\u00fdmi vlivy, tak\u017ee nedoch\u00e1z\u00ed k \u010dern\u00e1n\u00ed vlivem tvorby oxidu nebo sulfidu st\u0159\u00edbra. B\u00edlozlat\u00fdm slitin\u00e1m zv\u00fdrazn\u00ed rhodiov\u00e1n\u00ed b\u011blost a lesk. U ostatn\u00edch zlat\u00fdch slitin je v\u00fdsledn\u00e1 efekt obdobn\u00fd, av\u0161ak po ot\u011bru vlivem pou\u017e\u00edv\u00e1n\u00ed postupn\u011b vystupuje p\u016fvodn\u00ed barva slitiny. To m\u00e1 za n\u00e1sledek reklamace. Proto\u017ee nedo\u0161lo k poru\u0161en\u00ed puncovn\u00edho z\u00e1kona (ryzost z\u016fst\u00e1v\u00e1 zachov\u00e1na), je t\u0159eba m\u00edt na pam\u011bti, \u017ee z\u00e1kazn\u00edk m\u016f\u017ee napadnout pouze prod\u00e1vaj\u00edc\u00edho za klamav\u00e9 ozna\u010den\u00ed. To je ov\u0161em mo\u017en\u00e9 pouze v p\u0159\u00edpad\u011b, \u017ee byl \u0161perk prod\u00e1n jako v\u00fdrobek z b\u00edl\u00e9ho zlata. Proto doporu\u010dujeme u rhodinovan\u00fdch \u0161perk\u016f uv\u00e1d\u011bt, \u017ee je povrch upraven rhodinem a zvl\u00e1\u0161\u0165 upozornit, jedn\u00e1-li se o barevn\u00e9 zlato jako z\u00e1kladn\u00ed materi\u00e1l. Puncovn\u00ed \u00fa\u0159ad v\u011bt\u0161inou informuje p\u0159ekladatele, pokud zjist\u00ed, \u017ee \u201edu\u0161e\u201c \u0161perku je z barevn\u00e9ho zlata. Odpov\u011bdnost za \u0161perk v\u0161ak nese samoz\u0159ejm\u011b prod\u00e1vaj\u00edc\u00ed. U rhodiovan\u00fdch \u0161perk\u016f z barevn\u00e9ho zlata lze p\u0159i pe\u010dliv\u00e9m prohl\u00e9dnut\u00ed pozorovat v m\u00edst\u011b, kde byly zkou\u0161eny na prub\u00ed\u0159sk\u00e9m kameni, nepatrnou \u017elutou skvrnku, kde prosv\u00edt\u00e1 z\u00e1kladn\u00ed materi\u00e1l. Ov\u0161em je nutno si uv\u011bdomit, \u017ee ot\u011br je prov\u00e1d\u011bn v\u017edy na nen\u00e1padn\u00e9m m\u00edst\u011b a na co nejmen\u0161\u00ed nutn\u00e9 plo\u0161ce.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Co rozum\u011bt pod term\u00ednem \u201eb\u00edl\u00e9 zlato\u201c? Zlato je v\u017edy \u017elut\u00e9. Neexistuje \u017e\u00e1dn\u00e9 \u010derven\u00e9, b\u00edl\u00e9, nebo r\u016f\u017eov\u00e9 zlato. Jsou ov\u0161em slitiny tohoto kovu, kter\u00e9 vlivem barv\u00edc\u00edch p\u0159\u00edm\u011bs\u00ed nab\u00fdvaj\u00ed r\u016fznou barvu. Tuto skute\u010dnost nen\u00ed t\u0159eba rozv\u00e1d\u011bt, proto\u017ee je zn\u00e1ma zlatn\u00edk\u016fm oded\u00e1vna. K tradi\u010dn\u00edm barv\u00e1m zlat\u00fdch slitin, ovlivn\u011bn\u00fdm pom\u011brem leguj\u00edc\u00edch p\u0159\u00edsad st\u0159\u00edbra a m\u011bdi, p\u0159ibyla v pr\u016fb\u011bhu devaten\u00e1ct\u00e9ho [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2584,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[2],"tags":[],"class_list":["post-2579","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sperky"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u0160perky s povrchovou \u00fapravou | Magaz\u00edn Altman.cz<\/title>\n<meta name=\"description\" content=\"Co rozum\u011bt pod term\u00ednem \u201eb\u00edl\u00e9 zlato\u201c? 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