Annatto, while initially strong, does fade substantially. I wrote about the marvellous depth of colour here, but after 5 weeks in the sunny Stoodio window, there is quite a difference in shade. Considering too that spring in Calgary does not have the longest amount of daylight or the strongest UV rating, this does not bode well for future use.
I’ll be overdyeing these, using them as a base colour, but will do more lightfastness tests, because it may still affect the final outcome. I do wonder though how substantive dyes allow other dyes over top—-indigo works, so will the annatto???
I also started two indigo vats today, one a conventional indigo/soda ash/thio and the other a 123 with indigo, calx and henna. Since the henna did not dye fabrics for me in a straight dye bath, i’m hoping it still has enough “chemistry” in it to work for the vat!
My friend Susan (also in Calgary, so we have location in common, but our water as well 😉 ) has started a separate blog too, for her natural dye processes. We’ve been trading notes and she generously shares much info on dye subjects i have little knowledge of.