I was really excited when I found out about “invisible” ink. I used both lemon juice and milk with a 100 watt light bulb as the developer. I wrote a bunch of different messages and drew pictures to see how they would look. I guess the sad part is that I never actually sent them to anyone. I just waited for them to dry and developed them for myself.
Also, The Book of Biff #4 preorder has begun! It’s on sale for only a limited time! Order your copy in the store!