Marrow turns blue when blue picks her up. Touching the core will dye all creatures including catgirl blue.
Marrow turns orange when orange picks her up. Touching the core will spawn three sunnies.
Any other creature picking up marrow, will turn marrow back to pink. Touching the core will reload catgirl's gun.
Instead of waiting for blue and orange to spawn on floor 1, it is easier for catgirl to go to floor 9 where blue, orange and marrow spawn naturally.