How's the sheepskin going?

The answer to that is that we are not sure :)
Having left it for a few days with salt on it (see the start of the process here) we scooped the salt off. At this point it had gone a bluish colour (which is good apparently). We then painted it with a solution of oxalic acid and salt (2l water, 1/4l salt, 30g oxalic acid powder). We have been doing this for 3 days now. The blue colour is meant to turn to white through the skin over a period of 4-6 days but I am not convinced I see it changing.

If it doesn't change in a few days we might try washing some of the salt out to let the oxalic acid work better, or perhaps dip the whole skin in an oxalic acid solution. It is tricky to find detailed descriptions of processes, why they work and alternatives on the internet (the font of all knowledge)