I think I got mixed up again! I put some of the frozen hollyhock flowers into a very loosely woven muslin bag, using equal amounts of flowers and warm water. You are supposed to soak it to get the dye solution. Here is where I got mixed up again.
I put the muslin bag in the pot where I had placed the folded silk, which had been soaked in alum. Then I put it aside to let the dye soak in, totally forgetting that I wasn't doing a contact dye experiment.
Well, I am now. I am going to leave it for one or two days and see what happens.
It is summer here and I have left it in the glasshouse, so the heat may affect the colour too. I remember reading that heating red plantstuff changes the colour, reduces the redness, I think. So I will see what eventuates. Not that it will get as hot as simmering it.
I am thinking that I might be able to use some of the pieces of fabric I have dyed in the Traveller's Blanket. I certainly have plenty of pieces of silk lying around waiting to be useful.