Good marking system

[Jon Allen]

I have given up on Sneak Thief Supreme as I have now twice been in trouble due to bad lighting. I have come up with a method that allows me to easily see which board belongs to who, yet I can hand out the boards to one person at the end with no fear of having the markings detected.

How invisible to you try to make your markings? Are there any good marking systems that do not rely on good lighting?

[Guest]

there is a very reliable marking system in Chuck Hicocks "Mentalism Incorporated". Lighting will not affect it.