My cipher and invisible ink equipment and book

Code & Cipher & invisible ink stuff I learned about in 4th school grade and as I grew up as a child and bigger. I wrote to an older cousin pen pal using secret codes, ciphers and invisible inks. 2 years before graduating from high school at 15 years old, I was allowed to do experiment with developing a universal developer for all but one invisible ink including water from a faucet in the kitchen or bathroom. That got me an A in Science Research Class in 11th grade.

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