When I am embossing, stamping, swivel knife cuts, and i want to create a 3D effect I will tool the SK cuts and on all the above I use a Gel coat, which is a THICK stain, I work it in the cracks and lower portions of the leather. Then I take a damp paper towel, and wipe the top surfaces off, leaving the cracks, cuts, depressions, etc, alone as muck as possible, to leave the gel in those areas. Continue wiping the surface until you have a good contrast of upper and lower impressions. Unlike dye which penetrates the leather deeper, you can NOT obtain this desired contrast, that in-hanses the 3D effect.