This is not rocket science, and the ratio does not have to be exact – mix 1 teaspoon full of baking soda (sodium bicarbonate) in half a cup of water. That’s it. Apply a thin coating of baking soda solution on your wood or fabric with a brush, spray or just your finger; let it dry before engraving. The solution does not go off, so you can keep it for future use.
Baking soda helps to brown wood and fabric when lasered, so the treated material requires a much lower setting (e.g. half the normal depth, which also means a lot faster) to engrave and gives better results.
Here are some tests of mine on wood and cardboard:
However, baking soda solution could make some wood turn green-ish. Please do a small test before apply it to a large piece of wood.
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