http://therockcolumbia.com/tip-permanent-markers/
Tip Permanent Markers
What kind of ink should I use to sign the back of a credit card?
My husband insists that one must use a pen. I argue that often stain wears off, and not even going to work. I prefer to use a fine-tipped Permanent Marker and have had great results. Is there a method preferred by banks?
Permanent waterproof ink or ink.
