Yes, you need a darkroom. Part of my Cigar Box Uke plan is to print some images onto the wood using my darkroom and a product I'd previously never tried called Liquid Light. Last night I got to print some test prints on some of the leftover cedar from the uke top I made. Works great, take a look:
You can view a larger version here.
The straight grain of the cedar worked well with it. The red oak, not so much. I might white wash the red oak back before printing on it. I'll have to think about it.
You can view a larger version here.
The straight grain of the cedar worked well with it. The red oak, not so much. I might white wash the red oak back before printing on it. I'll have to think about it.