does anyone of you know some links where i can get information on how to make an organic highlighter?

Answer 1

Try the link below to get some ideas of what dyes to use, for example for yellow:
Turmeric, orange peel, lemon peel, carrot tops or cumin.

These would need to be dissolved in 190 proof alcohol in order to use as an all organic highlighter. Wood alcohol (methanol) would work better, but may not be considered "Organic."