I thought this would work, from the experience I have had in hand dying crochet snowflakes, I have done both white and ecru, and done many dye jobs on many different types of materials for many years, with literally oodles of dyes, both natural and man made.
I am going to test some dyes out on other threads, such as, I am going to take one of the lizbeth lime greens I dearly love, and fade the green to a dark green, I don't want any white or ecru, just that chartreuse-ish to dark variegated thread, and I would love to have that for a project.
The HDT's above are 100% cotton size 20, and I love the
way they came out, I haven't used them in my tatting yet,
but I will let you know how they tat up when I do.
The colors shown here, at least on my computer screen, are pretty accurate :)