On what background colour should I apply my paint?

Most of our special effect paints need to be applied over a particular background colour (usually white or black) as they are semi transparent. The background colour is different depending on the type of effect and also according to the colour reference. On each product sheet can be found the instructions for the background colour, and sometimes (as is the case for Diamond paints) a PDF with a link in red to a table for the background colours.