The black color of the plaster in my homemade plaster nest is due to the mixture of charcoal and sumi ink. If desired, I can also drill 8mm, 10mm, or 12mm holes in the sides. A 5mm syringe filled with plaster is inserted, allowing for water absorption into the plaster within the syringe without opening the lid. An additional syringe can be included as an option. Options: Additional syringe filled with plaster: ¥150 Small food dish: ¥100 Large food dish: ¥250