No, thanks to the special toners that are dedicated to such conditions. Our products were tested in the Ceramic and Glass Institute and passed them all. We give you a satisfaction guarantee that grants you the right to return the product if you are not happy with the result. We guarantee the quality of our photoceramics and their colours. Please keep in mind that golden and silver stripes are not made with photoceramic toners and the guarantee does not include the stripes.