Yesterday, a customer asked me if I can make laser cut wood edges as black as possible as it would enhance her products. She wanted this even if it caused some charring on the surface which could be sanded off. No other customers had asked for this before. They just accepted that the edges would look as they came, and I would prepare them for what to expect.
The colour of a laser cut wooden edge is more to do with the colour of the wood used. A pale wood like birch or sycamore will have a lighter cut edge. Oak will be darker and mahogany darkest of all.
Best machine settings for laser cutting wood
The golden rule of laser cutting is to cut through cleanly in one pass as quickly as possible with a maximum of 90% power. This should minimise damage to the material and maximise product quality. If you cut more slowly than you need to, you don’t get a darker edge. You just get charring and flaming on the back of the wood. And it’s possible that the flaming could ignite the wood and cause a fire in the laser machine.
In this case, all the woods from plum to sycamore had quite dark laser cut edges. Kirsty makes wooden jewellery from the tiny shapes and sometimes paints them. You can find her as Hamespuns on Instagram.