Hello sir, Gold-plated products (especially decorative plates, gold gilding on the edge of the glass) are very delicate. All kinds of strong detergents — including Por Çöz — can dull or erode this coating over time. � � Suggested use: Plate, glass, mug, etc. with gold decoration or gilded edges. it is safest to not put items in dishwasher. Washing these products by hand with a gentle sponge and warm water will extend the life of the gold details. If you need to put it in the machine, use a low temperature (40 ° C six) and use a gentler wash option like the glass program. In summary: � � Por Sol Gel performs perfectly on normal metal, glass, ceramic products. � � However, there is a risk of color fading or gilding peeling off over time in products with gold details or gilding.