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[boxmint]

So I have been testing out different types of invisible ink, and I am here to tell you that milk does not work. It just makes the paper wrinkly. I have higher hopes of lemon juice. Anyone else have ideas

Comments

[kengwen]

Perhaps the problem is less the milk than the paper? I suspect lemon juice, being liquid, will cause the same issue...

[kengwen]

Might I ask the motivation behind testing invisible inks?
I wonder if you were using whole or skim or some other variety and whether that makes a difference. It would be the proteins that brown when exposed to heat, and all varieties would have that, no? Am I confused? Did lemon juice work?