LATE BLACKBERRIES

There are still lots of blackberries on the bushes but most of them are past their best. I need to pick loads to use for fabric dying experiments before they're completely over. Also elderberries although these are only just starting so I have some time.

I wonder how similar/different the colour from the two types of berry will be.  And I wonder how simple I can make the process. I believe salt can be used as a fixative for berry dyes so that's where I'll start.