Red Onion Green
Red onion skins are turning out to be a fascinating dyestuff. Last year I used them on unmordanted silks and a piece of cotton in one of the solar dye jars. I got reddish purples and browns that turned green if dipped in iron.
This time I tried hot extraction and hot dyeing on alum mordanted fabrics. The results were quite striking greens on cotton and silk noil and browns on the lighter silks. The organza turned a very dark brown.
So apparently red onion skins can give anything from red to green and brown but is there a way to control which colour? My guess is that it depends either on the temperature (red needs lower) or the mordant (red dyes better on unmordanted silk) or the quantity of dyestuff (too much and the red turns brown). If you've dyed with red onions I'd be interested to hear about your results!
PS I've added a small feather No.11 to the shop. It's of the 'shells & feathers' variety.
PPS In the fantastic Internet Archive there's a wealth of 19th century dyebooks readable online. I love the indigo chapter in this one. And I really need this book.