Part used: bark
Colour range: browns, orange
Mordant: none, alum
Light fastness: good
WOF: 50-100%
Cold dyeing: yes
Hot dyeing: yes
Low Impact Method: no
 
Always soak bark and roots overnight before heating. Use a dye bag when dyeing wool or the bits will get stuck in the fibers. Heat slowly to below a boil, boiling may dull colours. No mordant needed but alum will intensify the dye results.
 
Poplar bark comes from a sustainable, renewable source in Europe.