Hi folks, now that I'm nearing having all the Omas inks, does anyone know if the ink is formulated, produced and bottled by Omas? The bottle is a nice little convenience when filling and I've been very satisfied with all, especially Red, Sepia, Blue, Turquoise, Green and the limited edition Orange. I have found the red ink to leave a crusty residue when dry around the ink bottle or pen section and if it is made by someone else for them, I'd like to compare it. Thanks in advance.