Opaque Primary process blue 15ml pot (33 ratings) Wow! Process blue embossing powder £2.75 Quantity: at £2.75 each Add To Basket 0 in your basket View Basket Checkout WOW! Opaque Primary Colours is an extension to the Primary range. They are made on an opaque base and thus give a very strong finished colour. These powders are smooth flowing with a lovely glossy depth.