Birch Bark Pink?

The results are in from my birch bark dye bath. I suppose that, stretching the imagination, the hues of brown have a slightly pinkish tinge, rather like washed-out mahogany. The shades are so close to one another that I'm glad that I added a 'marker' string of tapestry wool to each skein when extracting them from the dye pots/pans; yellow for alum, green for tin, orange for copper and grey for iron. Without such a marker, it could be difficult to work out which skein had been treated with which mordant once all the skeins had been washed and dried. From left to right, you are looking at the results for alum, copper, alum+tin and, much more distinctive, alum + iron.