The white marks look like areas where chemical hasn't penetrated the hide, each mark looks like you could fold it over on itself (mirror image if you like) which says you had hide on hide contact while it was in the solution.
Hopefully enough chemical has soaked in and the hide is ok.
I tanned rabbit hides commercially for a few years and had the same issue if I tried to squeeze too many pelts in the Barrel at once.
Never heard of water blasting them either, once dry you want to keep them dry.
Bookmarks