15g indigo, 30g calcium hydroxide and 45g fructose
I made it up as as a small vat only 400ml and put it in a hot water bath to keep warm
It started off a pale blue colour with the indigo mixing with the calcium hydroxide and gradually reduced as you can see over about 15 minutes. It dyed a piece of linen a pale blue then some silk also a pale blue. I added 100ml of it to my vat of yesterday and got a very pale greyish blue but nothing else. Yesterday's vat was pH 9. The little vat was pH11+
Thanks to Leena and Debbie for suggestions.