Fitting in the Love

So one day Pumpkin gets in my car after school and says, "I found something in a book at school today I want to do at home." We encourage learning at home so I asked her to tell me what she wanted to do. She tells me she wants to write a secret message on paper and make it show up. This sounds awesome. I however am not the scientist of the family. I am the last person you want messing with this stuff. How in the world I got through biology I have no idea (no really I do my partner and I made crude jokes while dissecting our animals because really science is not my thing.) Pumpkin begins to explain what she read in the book to me. "We need to get a lemon and squeeze it. Then we take the juice and a stick with the balls on the end and write on the paper. Then we take salt and rub it on the paper. Then we dump the salt in the garbage. And  then we get a black crayon and we rub it on the paper and the words show up. That is what it said in the book. Can we do this mom, c...