1.0Copper Traces PKS BRONZEhttps://kupferspuren.at/en/Johannes Zopfhttps://kupferspuren.at/en/author/johannes/rich600338<blockquote class="wp-embedded-content" data-secret="EKLVjGVBt1"><a href="https://kupferspuren.at/en/informations/why-copper/patina-or-verdigris/">Verdigris or patina</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://kupferspuren.at/en/informations/why-copper/patina-or-verdigris/embed/#?secret=EKLVjGVBt1" width="600" height="338" title="“Verdigris or patina” — Copper Traces PKS BRONZE" data-secret="EKLVjGVBt1" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://kupferspuren.at/wp-includes/js/wp-embed.min.js /* ]]> */ </script> Grey-green surface layer on copper and copper alloys consisting of basic carbonates and sulphates, which forms through reaction with the carbon and sulphur dioxide contained in the air. Patina is also known as "noble rust" and protects copper from weathering.https://kupferspuren.at/wp-content/uploads/2018/01/Verdigris.jpg?wsr600394