My laptop and our new desktop computer have cool looking black keys with white painted letters. After a while, certain keys lose their painted letters from fingernail strikes. Note the A, S, D, H, L, E, R, T, O, N, and M keys. In low light it can be hard to find the right key. There is a way to restore the damaged keys without paying the price of a new keyboard for caps.
Step 1: Use your word processor
Type the damaged letters in your word processor. Use the Arial font. I set the font size at 22 points. I elected to have the color of the letters as white and the background color black. In OpenOffice.org Writer you pull down Format and select Character. Then look for Background and Font Effects.