{"id":4734,"date":"2017-11-28T09:43:30","date_gmt":"2017-11-28T12:43:30","guid":{"rendered":"https:\/\/feninjer.com.br\/joalheria-de-curitiba-espera-crescimento-de-20-nesse-natal-copy\/"},"modified":"2017-11-28T11:05:01","modified_gmt":"2017-11-28T14:05:01","slug":"contraste-a-indicacao-do-teor-do-ouro-de-uma-joia","status":"publish","type":"post","link":"https:\/\/feninjer.com.br\/?p=4734","title":{"rendered":"Contraste: a indica\u00e7\u00e3o do teor do ouro de uma joia"},"content":{"rendered":"<p><em>Da Reda\u00e7\u00e3o<\/em><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-4736\" src=\"https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/CONTRASTE.jpg\" alt=\"\" width=\"460\" height=\"300\" srcset=\"https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/CONTRASTE.jpg 460w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/CONTRASTE-300x196.jpg 300w\" sizes=\"(max-width: 460px) 100vw, 460px\" \/><\/p>\n<p>As joias de ouro vendidas nas joalherias de todo o mundo apresentam em sua parte interna uma grava\u00e7\u00e3o que indica o teor de ouro com que elas foram confeccionadas, chamada de contraste.<br \/>\nEsse contraste \u00e9 gravado pelo fabricante e nas joias de ouro 18 quilates pode ter o padr\u00e3o da norma americana (18k) ou da norma europeia (750).<br \/>\n\u00c9 imposs\u00edvel a olho nu diferenciar uma joia confeccionada com ouro 70 ou 750, mas a diferen\u00e7a de ouro puro que encontramos em uma e outra \u00e9 grande.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-4737\" src=\"https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-1.jpg\" alt=\"\" width=\"900\" height=\"368\" srcset=\"https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-1.jpg 900w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-1-570x233.jpg 570w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-1-300x123.jpg 300w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-1-768x314.jpg 768w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-1-600x245.jpg 600w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/p>\n<p>Muitas joalherias testam o teor de ouro das joias que compram. A publica\u00e7\u00e3o Mais Varejo, editada pelo IBGM, aponta que o teste mais usado \u201c\u00e9 chamado de de \u2018teste por pedra de toque\u2019, e \u00e9 conhecido desde 600 a.C. Ele deve ser realizado por pessoas capacitadas, pois existem diversas singularidades que devem ser levadas em conta\u201d. Basicamente s\u00e3o usados:<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-4739\" src=\"https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-2-1.jpg\" alt=\"\" width=\"900\" height=\"764\" srcset=\"https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-2-1.jpg 900w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-2-1-570x484.jpg 570w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-2-1-300x255.jpg 300w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-2-1-768x652.jpg 768w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/tabela-2-1-600x509.jpg 600w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/p>\n<figure id=\"attachment_4740\" aria-describedby=\"caption-attachment-4740\" style=\"width: 460px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-4740\" src=\"https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/teste-de-ouro-por-pedra-de-toque.jpg\" alt=\"\" width=\"460\" height=\"455\" srcset=\"https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/teste-de-ouro-por-pedra-de-toque.jpg 460w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/teste-de-ouro-por-pedra-de-toque-100x100.jpg 100w, https:\/\/feninjer.com.br\/wp-content\/uploads\/2017\/11\/teste-de-ouro-por-pedra-de-toque-300x297.jpg 300w\" sizes=\"(max-width: 460px) 100vw, 460px\" \/><figcaption id=\"caption-attachment-4740\" class=\"wp-caption-text\">Teste de ouro por pedra de toque<\/figcaption><\/figure>\n<p><strong>Procedimento<br \/>\n<\/strong>\u00c9 feito na pedra de toque um \u2018esfrega\u00e7o\u2019 da joia a ser testada e um \u2018esfrega\u00e7o\u2019 de uma ou duas pontas da estrela, ambos com as mesmas dimens\u00f5es, geralmente 30mm x 5mm. O \u00e1cido \u00e9 passado sobre os esfrega\u00e7os e, ap\u00f3s o processo estar completo, enxugado com o mata-borr\u00e3o. A experi\u00eancia permite comparar\u00a0 o resultado obtido nos \u2018esfrega\u00e7os\u2019, determinando o teor do metal testado.<\/p>\n<p>Testes qu\u00edmicos rigorosos tamb\u00e9m s\u00e3o efetuados em algumas empresas. Os chamados de copela\u00e7\u00e3o s\u00e3o extremamente precisos (margem de erro de 0,1%), no entanto, t\u00eam a desvantagem de serem destrutivos, inutilizando as joias.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Da Reda\u00e7\u00e3o As joias de ouro vendidas nas joalherias de todo o mundo apresentam em sua parte interna uma grava\u00e7\u00e3o que indica o teor de ouro com que elas foram confeccionadas, chamada de contraste. Esse contraste \u00e9 gravado pelo fabricante e nas joias de ouro 18 quilates pode ter o padr\u00e3o da norma americana (18k) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4741,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"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":"var(--ast-global-color-4)","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":"","_links_to":"","_links_to_target":""},"categories":[6,101],"tags":[941,942,939,609,893,309,940],"class_list":["post-4734","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gestao","category-metais-e-gemas","tag-18k","tag-942","tag-contraste","tag-joia","tag-liga","tag-ouro","tag-teor"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Contraste: a indica\u00e7\u00e3o do teor do ouro de uma joia - FENINJER+ 2026 | A Maior Feira de Joias da Am\u00e9rica Latina<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/feninjer.com.br\/?p=4734\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Contraste: a indica\u00e7\u00e3o do teor do ouro de uma joia - FENINJER+ 2026 | A Maior Feira de Joias da Am\u00e9rica Latina\" \/>\n<meta property=\"og:description\" content=\"Da Reda\u00e7\u00e3o As joias de ouro vendidas nas joalherias de todo o mundo apresentam em sua parte interna uma grava\u00e7\u00e3o que indica o teor de ouro com que elas foram confeccionadas, chamada de contraste. 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