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mom2five
mom2five asks:
Q:

I want to do the invisible writing w/my preschool....not good w/science so how do I explain that you can see the writing w/a lamp.......Vickie

In Topics: Helping my child with science
> 60 days ago

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Answers (1)

Patrick08
Patrick08 writes:
There are acids in lemon juice.  When these acids are on paper and heat is applied to them, oxygen gets drawn in.  This causes the darkening reaction that makes the "ink" visible.
> 60 days ago

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