With so many balls of 'wool' without a label, I'm going to do these little felting test pieces. I'll need to do them in small batches like this so as not to confuse the issue - I'll add a green and a blue to this batch.
They will then be pinned, with safety pins, to a towel and washed on a 60° cycle with normal laundry detergent.
This was a very successful exercise! I know now which ones I can use in a felting project.
All but that middle blue, it seems.
I've pinned each little tuft to the corresponding ball. This will be a long process and this is the easiest way I can think of to keep track of which is which.