Are there multiple makers of kumadori pigments, like ordinary cosmetics?

There are several — but the scale is nothing like that of ordinary cosmetics. Demand for kabuki makeup is inherently limited.

The field does not stand on kabuki alone. It exists as a specialism overlapping the makeup of Japanese dance, noh and kyōgen, shinpa and other stage arts. A handful of long-established houses and specialist shops make and supply it, handling the whole range — the white, the paste reds, indigo, pomade, and the brushes and tools besides. Shops of this kind have traded near the Kabukiza for many years.

From the actor's side, the choice is personal. How the white spreads, how the red comes up, how hard the pomade sets — these differ subtly between products, and some suit a particular skin and a particular hand. Having once found what suits him, an actor is said to stay with it for years. This is less connoisseurship than a practical decision to keep a daily task stable: in the dressing room before going on, the hand should not hesitate. The choice of materials is itself part of the craft.