Very interesting. If I understand correctly, it is exactly the same pigment, coming from the same sea snail (Hexaplex trunculus), only that the application to t

Very interesting. If I understand correctly, it is exactly the same pigment, coming from the same sea snail (Hexaplex trunculus), only that the application to textiles was different: if you dye a cloth and keep it in the dark until it dries out it becomes reddish-purple, if you let it dry in the sun it becomes blue.