{"title":"Mugs","description":"\u003cp\u003eThe copper mug holds 400 millilitres and has a handle, so you can pick it up with hot tea in it too. There is felt under the base: it protects a wooden table and takes the noise out of setting it down.\u003c\/p\u003e\u003csection class=\"kopero-composition-update-20261021\"\u003e\u003ch2\u003eNew composition analysis - 21 October 2026\u003c\/h2\u003e\u003cp\u003eRTC (2021): 99.21% copper and 0.75% zinc. URS (21 October 2026), a separate bottle sample: 99.18% copper and 0.498% zinc.\u003c\/p\u003e\u003cp\u003eThe new report concerns one copper bottle. It cites ASTM E 478:2008 as its reference method. It is a composition analysis, not a migration or food-contact test. No batch number is recorded.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/pages\/test-dossier#meting-2026\"\u003eRead the test dossier\u003c\/a\u003e\u003c\/p\u003e\u003c\/section\u003e\n\u003cp\u003eCopper conducts heat better than almost any other metal. Cold water feels cold in your hand almost immediately, and that is exactly what makes a copper mug different from an earthenware one. How copper compares with plastic and stainless steel is in \u003ca href=\"\/blogs\/kennisbank\/koper-vs-plastic-vs-rvs-een-eerlijke-materiaalvergelijking\"\u003ethe material comparison\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eSolid copper at 99.21% (RTC 2021) purity, independently tested for food safety, with no coating and no inner lining. Available smooth or hand-hammered. Black coffee and tea work perfectly well; lemon tea, very acidic fruit teas and soft drinks go into a different cup, because they are acidic enough to dissolve copper faster. Everything that can go in it is in \u003ca href=\"\/blogs\/kennisbank\/koffie-en-thee-uit-een-koperen-mok\"\u003ecoffee and tea from a copper mug\u003c\/a\u003e. The rest of the care routine is in \u003ca href=\"\/blogs\/kennisbank\/koperen-fles-onderhouden-schoonmaken-polijsten-en-bewaren\"\u003ecleaning and polishing\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"kopero-premium-koperen-mok","title":"Kopero Copper Mug","description":"\u003cp\u003eThe mug is the only piece of Kopero drinkware with a handle, and that changes what you use it for. Copper conducts heat quickly, so a hot tea or coffee warms the wall within seconds. With the handle you still pick it up as normal.\u003c\/p\u003e\n\u003cp\u003eThat same conductivity works the other way round just as well: cold water in a copper mug feels cold in your hand almost at once.\u003c\/p\u003e\n\u003cp\u003eFour hundred millilitres is a generous cup of coffee or tea, or a portion of water that can rest overnight in the tamra jal tradition. More on that in \u003ca href=\"\/blogs\/knowledge-base\/tamra-jal-the-ayurvedic-tradition-of-drinking-water-from-copper\"\u003ethe article on tamra jal\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eThere is felt on the base. That saves scratches on a wooden table and it saves noise when you set the mug down. Beyond that you choose between \u003ca href=\"\/blogs\/knowledge-base\/smooth-or-hammered-copper\"\u003esmooth and hammered\u003c\/a\u003e: an even surface, or a hand-worked pattern that breaks the light. The mug itself is formed from a single piece of copper, with no seam. The handle is brazed on separately, on the outside. Nothing of that joint reaches the inside, so your drink only touches the copper mug itself.\u003c\/p\u003e\n\u003cp\u003eThere is another reason copper became the tradition. In EPA tests, cleaned copper killed more than 99.9% of bacteria such as MRSA and E. coli within two hours, and since 2008 it has been registered in the United States as an antimicrobial material. It is also a trace element your own body uses, from energy metabolism to the transport of iron in your blood. Stainless steel and plastic are inert and do neither. The evidence is in \u003ca href=\"\/blogs\/knowledge-base\/can-copper-really-kill-bacteria-the-evidence-from-epa-to-southampton\"\u003ecan copper really kill bacteria\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eHow to get the most out of your copper\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"\/blogs\/knowledge-base\/coffee-and-tea-from-a-copper-mug\"\u003eCoffee and tea are for drinking fresh\u003c\/a\u003e: pour, drink and rinse the mug afterwards. Lemon tea, sharply acidic fruit tea and soft drinks are at their best in glass.\u003c\/p\u003e\n\u003cp\u003eWash the mug by hand and keep the felt base as dry as you can; the dishwasher is bad news for both. The rest of the care routine is in \u003ca href=\"\/blogs\/knowledge-base\/maintaining-a-copper-bottle-cleaning-polishing-and-storage\"\u003ethe care article\u003c\/a\u003e, and the natural darkening is covered in \u003ca href=\"\/blogs\/knowledge-base\/why-is-my-copper-turning-green-or-black-and-is-that-a-problem\"\u003ewhy is my copper turning green or black\u003c\/a\u003e.\u003c\/p\u003e","brand":"Kopero","offers":[{"title":"Smooth","offer_id":54697656451413,"sku":"8720726791458","price":34.95,"currency_code":"EUR","in_stock":true},{"title":"Hammered","offer_id":54697656484181,"sku":"8720726791588","price":34.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/7259\/4005\/files\/kopero-mok-glad-1.jpg?v=1791102152"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/7259\/4005\/collections\/kopero-combi-mokken.jpg?v=1788937453","url":"https:\/\/kopero.com\/collections\/mugs-1.oembed","provider":"Kopero","version":"1.0","type":"link"}