Black envelopes require thick inks, preferrably light colors. Gel pens work best, as usually fountain pen inks are thinner. Metallic inks are my favorite on black stationary.
(any resemblance to fictional heroines is purely coincidental)
About a hundred of these placement cards were written in less than two hours – the blank tent cards were inexpensive and perfect for the job. The calligraphy style matched the invitations.