I've not actually tried dyeing fritz but I'd check your temperatures and dye amount. Green dyes are made up of various colours (blue+yellow+others depending on shade/tint) and they may "take" best at different times and temperatures. For instance, with chartreuse, in hard tap water the yellow takes first at high temperature whilst the green element takes better at low temperatures. It's possible you've used too much dye at too high a temperature and all the yellow has saturated the fritz. Just my guess.
Flyfishing-UK might be able to help you, I believe he dyes his fritz himself.
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