Only the center card had the letter "A" written on the diagonal corners using the Regular Luminous solution/ink (single coat)
IMPORTANT: Since you control the amount of solution to apply, you can simply place another coat of the NU-CONcept Regular Luminous Marking Solution to make the marks easier to read. As you gain experience only a single coat is required.(On this web page, photos show Bee cards use a single coat and the example of Bicycle cards used 2 coats of NU-CONcept Luminous Marking Solution will look darker.)
NOTE: Bear in mind that the "regular luminous filter is VERY different than the Ultra-Luminous filter, so you will not be able to see Ultra-Luminous marks if you buy the regular luminous product.