Collodion dark tent and processing apparatus, Murray & Heath, London; comprising a wood collapsible dark tent, the front stamped Murray & Heath London'; a wood compartmentalised chemical and processing chest containing space for developing baths, pneumatic plate holder marked Murray & Heath, gutta-percha chemical jars, a glass chemical holder with paper label Iodised collodion and three glass bottles one with paper label Iron Developer, the box stamped 'Murray & Heath London'; a wood collodion chemical tank with an 11-inch wide x 14