Colour Fastness Test
This test consists on spooling-up the dyed threads around a piece of cardboard and covering part of them while exposing the other part to sunlight.
The results after two months are quite pleasant:
From left to right: Blackberry (Rubus fruticosus) leaves, Pepper Chili (Capsicum annuum) Leaves , Pepper Chili (Capsicum annuum) leaves, Cherry (Prunus Avium) bark, Pear (Pyrus communis) leaves, Acer palmatum leaves.