I have a simple problem. Borax and smearing after engraving. How do you solve this problem? Thank you.
Tomas, a picture is worth more as 1000 words 
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It’s more of a general question, because if I etch on borax-coated material and then run my finger or a rag over it, the product smears, like soot… 
When I have soot on the engraving or the edges when cutting, I use technical alcohol and cotton cloths.
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It is soot because you just burned the wood. You are not converting the borax to black. I skip the borax and just wipe the wood with a microfiber cloth. Others use isopropyl alcohol (sometimes stated as IPA) and a cloth.
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Don’t touch it. Blow it off with some air and SPRAY a clearcoat. After several coats you could sand lightly to get roughness off.
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