latterlig:

anngjerd rustand, blåbær og aske, 2015

juice extracted from bilberry (european blueberry) and wood ash soaked in water are mixed together and poured on to a sheet of wrapping tissue paper. the pigment that gives bilberries their distinct colour is ph sensitive. by increasing the proportion of ash, which is a base, the colour changes from a bright red to shades of purple, blue, and green, until it degrades into an earth tone