Copag Jumbo face 2 index Marked Cards

Red and blue Copag 2 index cards are available. Each deck contains 52 cards,2 jokers and one guarantee card. With 4 PIP Jumbo index ,this Copag playing cards is wide size (2? x 3?)
How to Perfectly marked 100% plastic marked cards?

Blue cards: big suits and numbers can be put in the middle of the back ( white mark) or four small marks on four corners
Red cards: suits and numbers can be put in the middle or small numbers and suits can be placed in four corners (white or black marks).
Before the customers order this Copag marked cards, the marks on four corner is more favorable. Under this condition, nomatter under which light and sunshine, the marks can not be noticed by naked eyes at all.