Hi my name is Caroline( please excuse this as I'm using voice to text) and I am tanned to Black Welsh mountain sheep skins. I used the ewe-tan-it kit. My training is in chemistry and I monitored pH pretty carefully I did however make two mistakes. I had the ewe-tan-it instructions from the kit and I was following them and then at some point during the week I printed out another set of instructions that were for ez-100 but not the sheepskin directions. Here are photos at the end after oil sweating. The two mistakes were not using neutralizing bath (I did check the pH right away in the tanner and added baking soda then, but I did not do a neutralizing bath before tanning). Also I didn't drain long enough I'm sure for all the wall to drain out liquids because the other set of directions had draining for 20 minutes not an hour. Advice appreciated, if it's not fleshed enough well I'm sorry.