When I was getting an annual, my A& P laughed at me and wanted to know why I
had so damn many placards. I told him it was required by my airworthiness
certificate and manual. He still laughed.

Black signs with white lettering can be made by printing out the text in a
photo program. Then, save it as a .jpg file and reopen. Then, convert it
to a negative and you will have white text on black.

Few printers print white (the ALPS does), but you can use this method to
make white on black. Using a photo printer, you can get pretty good
results. Some of the photo printers use metal dyes and are quite permanent.

Colin