Important Note :: Some inks, especially metallics, are slightly transparent for the purpose of layering colors. Since the goal here is to stamp something legible rather than artistic, I don't recommend them.
USE + CARE OF YOUR CLEAR STAMPS
If you plan on using a lot of different color inks, it's a good idea to clean your clear stamp after each use. I use a couple squirts of SPRITZ Rubber Stamp Cleaner, and it washes the ink off instantly. If you want a simple solution, try a little mild soap on a toothbrush and rinse with water. Pat dry with a paper towel.