Accidentally Ferrotyped my BW negs. Anything I can do?

It looks like I didn't fully dry some 4x5 sheet before putting them in sleeves

and as a result they have a few ferrotyped blotches on them

 

Will a rewash help? or am I stuck?

At first, your problem seemed much worse. If you have actually ferrotyped your negatives it would mean that you had put them on a hot, smooth metal surface to dry them, in which case you would be up the creek so to speak.

 

First, remove any negatives that you can without harming the emulsion, which may try to stick to the sleeve. When you are left with only those that cannot be removed without emulsion damage, soak the sleeve in water with some wetting agent added. Then VERY GENTLY spread the sleeve to allow water to flow onto the negative. This should release the emulsion and allow you to carefully remove the negative from the sheet. The wetting agent may help the removal process and help prevent scratches. Once you have them out, soak them in water + wetting agent and dry as normal. It's hard to say what you'll end up with, but if you are patient and work carefully, you should be able to at least extricate the negatives.

 

- Randy

Scan your negs in the sleeves before you attempt to remove them. Then if you do loose some emulsion when you wet and remove them,the subsequent scans can have the holes filled in from the sleeved scans using Paint Shop Pro or equivalent.