jan 21, 2021 | vzdelávanie
Ak opomenieme dôvod pozlacovania mosadných šperkov aby vyzerali ako zlato, pozlacujú sa preto aby krásne vydržali dlhšie. Mosadz je sama o sebe krásny kov, ale pôsobením vzduchu oxiduje- zelenie a černie. Ak sa napríklad len dotkneme vyleštenej mosadznej plochy,...jan 19, 2021 | vzdelávanie
Nikel je kov, ktorý dnes spôsobuje jednu z najtypickejších kožných alergii. Je naň alergická desatina populácie, hlavne vďaka opakovanému vystavovaniu sa vysokým dávkam. Nikel môžeme nájsť vo väčších množstvách napríklad v telefónoch, minciach, zipsoch, rámoch...Cookie | Dĺžka trvania | Popis |
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