Bizman62

I'm waiting for a thread of that project to see how it goes

According to this study there's tannin in ebony at least in the fruit, leaves and bark. But as the study shows the deeper you go the less tannin there is. And tannin is the key for darkness in vinegar ebonising.

If the tannin content of bare ebony doesn't give you the desired darkness, you can use black tea or/and walnut husks to increase the tannin content as described here: https://makerdesignlab.com/experiments/how-to-ebonize-wood/

On 12/25/2020 at 7:45 AM, Brdibbi said:

how does a 32 mm router bit go to 29 mm depth? I'm new to guitar building sorry : - }

Routers have a lockable depth adjustment system. So if the router bit is 32 mm long (the bladed part, the yellow one in the picture) you simply push it down until it protrudes 29 mm outside the base plate and lock it there. When you're using a template you'll need bits with a bearing like the ones shown. Make sure that you start so that the bearing rolls along the template. If you need to go deeper than the length of the bit, you can first route with the template attached and then remove the template and run the bearing against the walls of the freshly routed cavity.