Here's a little tip my upline, Rosalie, shared with me....punch a 1/4" circle of cardstock, and adhere it to the top of the matching ink refill cap with a dot of Crystal Effects. They fit perfectly! Since it's a good idea to store your ink in a dark place to prevent the colors from changing/fading, I keep mine in a basket in the top drawer of my craft desk. I can tell at a glance which color I need to grab when it's time to re-ink a Stampin' Pad! Note: always double-check to make sure you have the right color before re-inking - I know some stamping friends (who shall remain nameless) who accidentally used the wrong color!