Sautin launi yana nufin matakin faɗuwa na yadudduka rini a ƙarƙashin aikin abubuwan waje (extrusion, gogayya, wankewa, ruwan sama, fallasa, haske, nutsewar ruwan teku, nutsar da ruwa, tabo na ruwa, gumi, da sauransu) yayin amfani ko aiki.Yana darajar saurin sauri dangane da discolorat...
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