Join Date: Sep 2014
From what I see, you didn't polish the blade sufficiently. It should be up to grit 2000-3000 (mirror polish; some pitting here and there is acceptable but the surface between pits should be mirror polished).
Then try etching.
For lower contrast/difficult wootz I use "reversed etching." More exactly I strengthen my Nital by adding about 10-20% Perma Blue and apply the solution to obtain a uniform blackening of the whole blade. Then gently wipe off the excess black oxidation with cotton wool swabs and Pre-lim.
PS: Are you sure it is wootz?