Ink

 is a writing resource, that can be made by combining black paint, water, and conical flasks in the church workbench and requires the Writing Supplies technology. Alternatively it can be purchased from the Astrologer for. A bottle of ink is required to complete Vagner the Actor's request for writing supplies so that he can write a poem to Ms. Charm. For each bottle of ink it's possible to craft 3x pen and ink which are used for writing.