I used a ratio of 2 to 1, water to blossoms. I simmered the blossoms for about 2 hours with a tablespoon of vinegar and a tablespoon of salt. (Trying to somewhat follow directions in Make Ink by Jason Logan.)
After straining, brushing some ink on watercolour paper, and letting it dry, I had a big surprise!
Yes! my lovely flowering crab ink dries green. But it is a lovely shade of green!