{"id":78189,"date":"2026-11-03T19:12:51","date_gmt":"2026-11-04T00:12:51","guid":{"rendered":"https:\/\/canadagold.ca\/?p=78189"},"modified":"2026-11-03T19:26:23","modified_gmt":"2026-11-04T00:26:23","slug":"what-spots-and-colour-changes-on-gold-bullion-really-mean","status":"publish","type":"post","link":"https:\/\/canadagold.ca\/fr\/what-spots-and-colour-changes-on-gold-bullion-really-mean\/","title":{"rendered":"Vous voyez rouge ? Que signifient r\u00e9ellement les taches et les changements de couleur sur les lingots d'or ?"},"content":{"rendered":"<p>Imaginez que vous ouvriez un \u00e9tui de protection pour admirer votre pi\u00e8ce d'or et que vous d\u00e9couvriez une minuscule tache brun-rouge\u00e2tre \u00e0 sa surface.<\/p>\n<p>Ce n'est pas ce \u00e0 quoi on s'attendait de la part de l'or, un m\u00e9tal r\u00e9put\u00e9 pour conserver son \u00e9clat pendant des milliers d'ann\u00e9es !<\/p>\n<p>C'est une question tout \u00e0 fait l\u00e9gitime. La pi\u00e8ce serait-elle endommag\u00e9e ? Y a-t-il eu un oubli lors de sa fabrication ? S'agit-il vraiment d'or ?<\/p>\n<p>La r\u00e9ponse risque de vous surprendre : <strong>m\u00eame les lingots d'or authentiques et de grande puret\u00e9 peuvent pr\u00e9senter des taches inhabituelles ou des marques en surface<\/strong>. Pour comprendre pourquoi, il faut commencer par un peu de chimie et examiner de plus pr\u00e8s comment sont fabriqu\u00e9es les pi\u00e8ces d'or.<\/p>\n<h2>L'\u00e9trange affaire de la tache rouge<\/h2>\n<p>L'une des caract\u00e9ristiques esth\u00e9tiques les plus reconnaissables des lingots d'or est une minuscule marque rouge, orange ou brun\u00e2tre. On les appelle commun\u00e9ment <em>taches de cuivre<\/em> ou <em>taches rouges<\/em>.<\/p>\n<p>L'or est lui-m\u00eame remarquablement r\u00e9sistant \u00e0 la corrosion. Le cuivre, en revanche, est beaucoup plus r\u00e9actif.<\/p>\n<p>Certaines pi\u00e8ces d'or contiennent du cuivre, ajout\u00e9 intentionnellement \u00e0 leur composition m\u00e9tallique. D'autres, notamment les lingots d'or pur \u00e0 99,99 %, peuvent contenir des traces infimes d'autres m\u00e9taux ou de contaminants.<\/p>\n<p>Lorsque des substances r\u00e9actives sont pr\u00e9sentes \u00e0 la surface, elles peuvent parfois provoquer une d\u00e9coloration localis\u00e9e.<\/p>\n<p>Les experts en classification des pi\u00e8ces ont constat\u00e9 la pr\u00e9sence de taches de cuivre sur des pi\u00e8ces d'or, expliquant que des concentrations de cuivre peuvent former des taches ou des stries rouge\u00e2tres.<\/p>\n<p>Dans le cas des lingots d'or de haute puret\u00e9, les explications possibles incluent \u00e9galement la pr\u00e9sence de traces d'impuret\u00e9s ou de particules introduites au cours du processus de fabrication.<\/p>\n<p><strong>Quelle est la principale diff\u00e9rence ? Une tache en surface n'est pas forc\u00e9ment le signe d'une d\u00e9t\u00e9rioration de l'or lui-m\u00eame.<\/strong><\/p>\n<h2>Mais l'or n'est-il pas cens\u00e9 \u00eatre r\u00e9sistant au ternissement ?<\/h2>\n<p>En gros, oui, du moins lorsqu'il s'agit d'or pur conserv\u00e9 dans des conditions normales de stockage.<\/p>\n<p>L'or est un m\u00e9tal noble, ce qui signifie qu'il r\u00e9siste \u00e0 bon nombre des r\u00e9actions chimiques qui provoquent la corrosion d'autres m\u00e9taux.<\/p>\n<p>L'argent se ternit facilement. Le cuivre peut noircir ou se recouvrir d'une patine. L'or pur, en revanche, reste remarquablement stable.<\/p>\n<p>La Monnaie royale confirme dans son <a href=\"https:\/\/www.royalmint.com\/invest\/discover\/gold-market\/taking-care-of-coins-and-bars\/\" target=\"_blank\" rel=\"noopener\">Conseils pour l'entretien des lingots<\/a> que l'or ne se corrode g\u00e9n\u00e9ralement pas et ne ternit pas.<\/p>\n<p>Ainsi, lorsque nous constatons une d\u00e9coloration sur des lingots d'or, il s'agit souvent d'une r\u00e9action impliquant un autre mat\u00e9riau, plut\u00f4t que l'or lui-m\u00eame.<\/p>\n<p>C'est une diff\u00e9rence importante par rapport \u00e0 la patine naturelle que l'on observe g\u00e9n\u00e9ralement sur les lingots d'argent.<\/p>\n<h2>Tout l'or n'a pas la m\u00eame couleur<\/h2>\n<p>Voici un autre d\u00e9tail int\u00e9ressant : deux pi\u00e8ces d'or authentiques peuvent pr\u00e9senter des nuances de jaune diff\u00e9rentes, m\u00eame si elles contiennent toutes deux exactement une once troy d'or.<\/p>\n<p>Pourquoi ? Parce que les lingots d'or se d\u00e9clinent en diff\u00e9rentes puret\u00e9s et compositions.<\/p>\n<table>\n<tbody>\n<tr>\n<td>Produit en or<\/td>\n<td>Composition<\/td>\n<td>Aspect caract\u00e9ristique<\/td>\n<\/tr>\n<tr>\n<td>Feuille d'\u00e9rable d'or canadienne<\/td>\n<td>or pur \u00e0 99,99 %<\/td>\n<td>Jaune intense<\/td>\n<\/tr>\n<tr>\n<td>Aigle d'or am\u00e9ricain<\/td>\n<td>91,67 % d'or<\/td>\n<td>Jaune aux nuances plus chaudes<\/td>\n<\/tr>\n<tr>\n<td>Sovereign traditionnel en or 22 carats<\/td>\n<td>91,67 % d'or<\/td>\n<td>Sa couleur varie du jaune au rouge\u00e2tre selon l'alliage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Le <a href=\"https:\/\/www.mint.ca\/en\/shop\/coins\/2025\/2025-gml-1-oz-9999-pure-gold-coin-bullion\" target=\"_blank\" rel=\"noopener\">Monnaie royale canadienne<\/a> fabrique des pi\u00e8ces d'investissement \u00ab Feuille d'\u00e9rable d'or \u00bb d'une puret\u00e9 de 99,99 %.<\/p>\n<p>D'autres pi\u00e8ces contiennent des m\u00e9taux d'alliage, tels que le cuivre ou l'argent, qui peuvent influencer leur couleur et leur durabilit\u00e9.<\/p>\n<p>La Monnaie royale a m\u00eame document\u00e9 l'\u00e9volution de la couleur des souverains en or au fil du temps, \u00e0 mesure que la composition de leur alliage \u00e9voluait.<\/p>\n<p>La couleur ne constitue donc pas \u00e0 elle seule un crit\u00e8re fiable pour d\u00e9terminer la puret\u00e9 ou l'authenticit\u00e9 d'une pi\u00e8ce d'or.<\/p>\n<h2>Une tache, une rayure ou autre chose ?<\/h2>\n<p>Toutes les marques inhabituelles pr\u00e9sentes sur les lingots d'or n'ont pas n\u00e9cessairement la m\u00eame explication.<\/p>\n<p><strong>Points brun-rouge\u00e2tre :<\/strong> Cela peut \u00eatre li\u00e9 \u00e0 des r\u00e9actions du cuivre ou d'autres oligo-\u00e9l\u00e9ments \u00e0 la surface.<\/p>\n<p><strong>Petites rayures ou traces de frottement :<\/strong> L'or est un mat\u00e9riau relativement tendre, surtout lorsqu'il est d'une grande puret\u00e9. Sa manipulation, le contact avec d'autres objets ou le frottement contre l'emballage peuvent laisser des traces visibles.<\/p>\n<p><strong>Diff\u00e9rences au niveau de la finition :<\/strong> Les lingots moul\u00e9s et les lingots frapp\u00e9s peuvent pr\u00e9senter des textures de surface tr\u00e8s diff\u00e9rentes. Un lingot d'or moul\u00e9 peut avoir un aspect moins uniforme qu'une pi\u00e8ce d'investissement frapp\u00e9e avec pr\u00e9cision.<\/p>\n<p><strong>Une couleur inattendue<\/strong>: L'alliage de la pi\u00e8ce, son proc\u00e9d\u00e9 de fabrication ou l'\u00e9tat de sa surface peuvent influencer son aspect.<\/p>\n<p>Aucune de ces observations, prise isol\u00e9ment, ne permet de d\u00e9terminer si un produit est authentique. L'authentification n\u00e9cessite des tests et des examens appropri\u00e9s.<\/p>\n<h2>Que faire si vous remarquez une marque ?<\/h2>\n<p>Avant de prendre un chiffon de polissage, suivez ces \u00e9tapes simples :<\/p>\n<ol>\n<li><strong>Ne touchez pas \u00e0 la surface<\/strong>. \u00c9vitez de frotter, de polir ou d'essayer d'enlever la marque.<\/li>\n<li><strong>Ne pas endommager l'emballage de protection.<\/strong> L'emballage d'origine peut contribuer \u00e0 prot\u00e9ger la finition d'un produit et peut rev\u00eatir de l'importance pour certains acheteurs.<\/li>\n<li><strong>Consultez les caract\u00e9ristiques techniques du produit.<\/strong> V\u00e9rifiez la puret\u00e9 et la composition attendues pour votre pi\u00e8ce ou votre lingot en particulier.<\/li>\n<li><strong>En cas de doute, demandez conseil \u00e0 un expert.<\/strong>. Un analyste sp\u00e9cialis\u00e9 dans les m\u00e9taux pr\u00e9cieux peut vous aider \u00e0 comprendre ce produit et \u00e0 d\u00e9terminer s'il convient de l'\u00e9tudier plus en d\u00e9tail.<\/li>\n<\/ol>\n<p>Le <a href=\"https:\/\/www.mint.ca\/en-us\/get-started\/coin-care\" target=\"_blank\" rel=\"noopener\">Recommandations de la Monnaie royale canadienne pour l'entretien des pi\u00e8ces de monnaie<\/a> sont particuli\u00e8rement clairs en mati\u00e8re de nettoyage :<\/p>\n<blockquote><p>\u201c Le simple fait d'essuyer des pi\u00e8ces avec un chiffon doux peut endommager leur finition et r\u00e9duire consid\u00e9rablement leur valeur. \u201d<\/p><\/blockquote>\n<p>Une petite tache peut n'\u00eatre qu'un probl\u00e8me esth\u00e9tique, mais les rayures ou autres dommages caus\u00e9s par le nettoyage peuvent \u00eatre irr\u00e9versibles.<\/p>\n<h2>Qu'en est-il de la valeur de revente ?<\/h2>\n<p>Lorsqu'ils \u00e9valuent des lingots d'or de qualit\u00e9 \u00ab investment grade \u00bb, les n\u00e9gociants en m\u00e9taux pr\u00e9cieux prennent en compte des facteurs tels que l'authenticit\u00e9, le poids, la puret\u00e9 et les cours actuels de l'or sur le march\u00e9.<\/p>\n<p>Une petite tache rouge n'a aucune incidence sur la quantit\u00e9 d'or contenue dans une pi\u00e8ce.<\/p>\n<p>Toutefois, l'aspect peut encore influencer le prix qu'un acheteur est pr\u00eat \u00e0 payer, en particulier pour les pi\u00e8ces de collection, les produits certifi\u00e9s ou les articles commercialis\u00e9s en parfait \u00e9tat.<\/p>\n<p>Cette distinction est importante :<strong> la teneur en or peut rester inchang\u00e9e m\u00eame lorsque la plus-value \u00e0 la revente d'un produit varie<\/strong>.<\/p>\n<p>Pour toute personne qui ach\u00e8te des lingots principalement pour leur teneur en m\u00e9taux pr\u00e9cieux, comprendre cette diff\u00e9rence peut aider \u00e0 relativiser les imperfections esth\u00e9tiques mineures.<\/p>\n<h2>L'or a lui aussi du caract\u00e8re<\/h2>\n<p>L'or a acquis sa r\u00e9putation gr\u00e2ce \u00e0 sa beaut\u00e9 intemporelle, mais cela ne signifie pas pour autant que chaque lingot ou pi\u00e8ce d'or conservera ind\u00e9finiment le m\u00eame aspect.<\/p>\n<p>Qu'il s'agisse de minuscules taches de couleur cuivr\u00e9e ou de diff\u00e9rences au niveau de la finition et de la couleur de l'alliage, plusieurs raisons peuvent expliquer pourquoi un lingot authentique peut pr\u00e9senter un aspect l\u00e9g\u00e8rement diff\u00e9rent de ce \u00e0 quoi vous vous attendiez.<\/p>\n<p>Vous souhaitez en savoir plus sur une pi\u00e8ce ou un lingot d'or que vous poss\u00e9dez ? L'\u00e9quipe de<a href=\"\/fr\/locations\/\"> Or du Canada<\/a> se fera un plaisir de r\u00e9pondre \u00e0 vos questions concernant la puret\u00e9 des m\u00e9taux pr\u00e9cieux, les produits d'investissement en m\u00e9taux pr\u00e9cieux et les caract\u00e9ristiques susceptibles d'influencer leur valeur.<\/p>\n<p>Et si vous vous \u00eates d\u00e9j\u00e0 demand\u00e9 pourquoi l'argent prend ces couleurs arc-en-ciel si spectaculaires alors que l'or, en g\u00e9n\u00e9ral, n'en prend pas, d\u00e9couvrez <a href=\"https:\/\/canadagold.ca\/fr\/why-does-silver-tarnish-understanding-toning-milk-spots-and-the-value-of-your-silver\/\">notre article compl\u00e9mentaire sur le ternissement, le patinage et les taches laiteuses de l'argent<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Imagine opening a protective case to admire your gold coin and discovering a tiny reddish-brown spot on its surface. That&#8217;s not what you expected from gold, a metal famous for keeping its brilliant appearance over thousands of years! It&#8217;s a reasonable thing to wonder about. Could the coin be damaged? Was something overlooked during manufacturing? [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":78190,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-78189","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why Does Gold Bullion Develop Red Spots? - Canada Gold<\/title>\n<meta name=\"description\" content=\"Discover why genuine gold bullion can develop red or copper-coloured spots, what causes surface discolouration, and whether it affects purity or resale value.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/canadagold.ca\/fr\/what-spots-and-colour-changes-on-gold-bullion-really-mean\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why Does Gold Bullion Develop Red Spots? - Canada Gold\" \/>\n<meta property=\"og:description\" content=\"Discover why genuine gold bullion can develop red or copper-coloured spots, what causes surface discolouration, and whether it affects purity or resale value.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/canadagold.ca\/fr\/what-spots-and-colour-changes-on-gold-bullion-really-mean\/\" \/>\n<meta property=\"og:site_name\" content=\"Canada Gold\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/CanadaGoldBBB\" \/>\n<meta property=\"article:published_time\" content=\"2026-11-04T00:12:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-11-04T00:26:23+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/canadagold.ca\/wp-content\/uploads\/2026\/11\/copper-spot-gold-johnson-matthey-bars.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1400\" \/>\n\t<meta property=\"og:image:height\" content=\"875\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Alyssa Barratt\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@CanadaGoldBBB\" \/>\n<meta name=\"twitter:site\" content=\"@CanadaGoldBBB\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Alyssa Barratt\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimation du temps de lecture\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/canadagold.ca\\\/what-spots-and-colour-changes-on-gold-bullion-really-mean\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/canadagold.ca\\\/what-spots-and-colour-changes-on-gold-bullion-really-mean\\\/\"},\"author\":{\"name\":\"Alyssa Barratt\",\"@id\":\"https:\\\/\\\/canadagold.ca\\\/#\\\/schema\\\/person\\\/d8d805597f450f74366791c67dcff8ac\"},\"headline\":\"Seeing Red? 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