Nano Colour Infusion Stainless Sinks - The colour is infused to the top section of stainless steel becoming part of the stainless steel & not a coating. While stainless steel is very hardy and durable, it is normal for stainless steel to scratch with every day use from or cleaning crockery, porcelain bowls and utensils. Scratches, scuffs and marks will show in silver grey colour of stainless.