Some of the results of Celtic dye experiments. Top row: colours from lichen purple with vinegar added to the dye-bath (except for a couple of woad samples on the extreme right). Second row: lichen purple colours, without vinegar added to the dye-bath. Third row: colours from hedge bedstraw (Galium mollugo). Fourth row: colours from weld (Reseda luteola). Bottom row: colours from oak bark. On each row some of the samples have been over-dyed in woad.