The photographic envelopers were used to develop plates, films and lantern slides. They had to be mixed as per instructions on the packet. These may have been used by an individual or by a local school or organisation.Wilma Davies, a long term resident of the Kiewa Valley donated this photographic equipment.Brownish/black cardboard box with no lid (broken off). Label is black, white and orange on front. The remaining parts of the label seal are on the sides with a 'picture' of (weighing) scales and words Trade Mark in black on orange and white. Inside the box are 31 clear plastic sealed cardboard boxes of "Colourform developer "B" Powder". The boxes are white with a label on the front with black and orange print. The ends are clear, the sides have "Colourform "B" in orange and the back has 'Directions' in black .Large box - Johnson Colourform Outfit Small boxes Colourform developer "B" powder.photographic equipment, photography, johnsons of hendon, colour form developer powder, photo developer, wilma davies