The colour is iDye Brilliant Blue which is available in the online store.
The doilies were added to the mix and then I tipped it all back into the pot on the stove and simmered for half hour.
Allow to cool and then wash thoroughly. As I was doing it by hand, I needed to rinse many times. Let dry and then iron. I cheated and threw mine in the dryer as I wanted to get the images done!