The difference in color is due chiefly to the process of “retting.”
When the retting is complete, the flax is set up in sheaves to dry.
The fiber is separated from the plant by retting, beating, etc.
This loss is greater the finer the stems, and the longer the retting.
Then the flax is bound in bundles for the next process, which is retting.
Most of this richness is ...