These Spirals are used to develop the reels used in analog photography.
In a dark room, the reels are put into these spirals which are then put into black boxes. All this is done in near to absolute darkness to protect the film from getting damaged by light.
The developing chemicals, stoppers and fixers are poured into this box. After developing, while the negatives are drying, the equipment is put into wash. Thence came this photograph.