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You could test a small amount but I'm doubtful. If you dyed it purple I would think that it would affect both the white and pink shades of the thermal. In other words both colors would be purple but possibly different shades.
I did test this on my thermal hair from dollyhair awhile back. I think I dyed it yellow, and that made the pink orange and the white yellow. The thermal change still worked at that point, although I didn't save the test swatch and couldn't say whether dyeing affected the long- term stability of the thermal properties.
I boil straightened thermal hair, and it did affect the changing propertys, it doesn't go back to the bright pink, and not back to pure white, it still changes, but not as well as it should.