It does interest me and thanks for the link.
The above links show the experiments of someone trying natural dyestuffs . Also see Ruarigh’s post in the Welsh Warrior colours thread Colours for Welsh
I am not sure that moves us forward however.
The range of colours available to Saxon and Norse seems to have been common to both.
What they did with those coloured threads is another thing of course. Any evidence Anglo Danes did anything distinctly different from Scandinavians?