First time I tried making this type of brine soap it was very easy to crumble and would not hold together at all. I tried to rebatch it and that didn't work, so I grated part it up and mixed it with another batch. I have made several batches since then with no problems until this last time. I am not sure why this last batch turned into a crumbly mess but again, I grated it and mixed it part into a new batch as confettii. The rest of it I grated and put in the pot with the oils for the next batch and it seemed to partially melt. Both batches seem to be fine, but they are very new and I have only tested small samples.
I do my soaping in a section of the garage that I set up but it was very hot out there that day and I don't take the heat well. So I wonder if the heat affected my process or just me. I have not had any problem with ash on any of the brine batches, but the first batch that I re-made ended up taking on an overall yellowish hue. Looks ugly, but the soap itself is very nice.
If it were me I would grate/chop it up and mix with other batch before it ages too much.