From brass syringe to moulded pichkari
The pichkari is old. The traditional object was a brass or bamboo syringe, drawn and pushed by hand, and it appears in Holi painting centuries before plastic existed. The mechanism has not really changed; the material and the price have.
Moulding is what turned it from a household object into a product sold by the crate, and it is why a manufacturer that makes both the colour and the plastics ends up making both halves of the festival.