Diamine Tyrain Purple Ink Bottle - 80ml Experience clean, beautiful and bold writing with wide color range of Diamine Ink. Manufacturer since 1864, Diamine Co. has been producing various color fountain pen inks, Calligraphy/ Drawing Ink & Stamp Pads and maintained the status till now. Diamine Ink has been the foremost choice for many pen enthusiasts as they have been manufacturing excellent quality of ink that goes along with all kind of brands.