Logwood dyeing

Strangely, all of the above fibres are dyed with logwood. As is often the case with plant dyes, if you process them differently, you get different effects. Logwood (usually bought as a powder or chippings from dye suppliers) I have found, produces colours ranging from red to magenta to purple to brown.
Red was obtained by solar dyeing the fibres (cotswold wool) in a large Kilner jar, using rain water. The chippings of logwood were put in the bottom of the jar on our East facing window sill in the hieght of sunny summer for a week, unmordanted wool and water were added.A bold red resulted!
This red wool when immersed for 30 mins in water with washing soda added turned magenta, excitingly!
A deep purple was obtained from (hard) tap water with Alum dissolved in it, soaking the logwood chips in it over night and then slowly heating it to simmer twice. The chips were strained off. The dye liquor was allowed to cool, then wool was added and heated up to simmer twice, slowly.  I left it in overnight, and a vibrant purple resulted.
The same logwood chips were allowed to soak overnight with tap water and Vinegar ( a whole bottle!), and in a similar process to before, I obtained a deep brown.
The logwood in the photos above has made the purple, brown and pinky red.
Aparentally it can also make blue. And I find it is a reasonably priced dyestuff too.