Extracts

The details of dyeing feathers in a systematic order:

1 The feathers must be wetted out before dyeing. This is best done in a weak soap solution or detergent solution so that the oil of the feather is penetrated.

2 The feathers are then well rinsed in lukewarm water.

3 The dye bath is made up and heated to 65 to 70°C. The feathers are then put in the dyed solution and left there for 5 to 10 minutes, and then a small percentage of acid is added. Oxalic acid is generally considered the best and dyed for a further 5 to 10 minutes according to the depth of shade required.

4 Rinse the feathers well in cold water and leave to dry naturally. In general acid colours are always used in preference to continued basics, but on rare occasions we have met the use of basics for the colouring of feathers, but we would consider them unsuitable.
The reason for dyeing without acid first and with later is to ensure a good depth of colour on the stems of the feathers.

Advice from Williams (Hounslow) Ltd
Manufacturers of dyestuffs, fine colours and chemicals, 1965