Tax-free* €14.4 A traditional Japanese colour reference, Ai-Iro is a beautiful blue with hints of green and grey. Natural indigo changes colour during the dye creation process, these changes are reflected by the colour. We chose Ai-Iro as the main colour for our brand. This ink is manufactured to our precise specifications exclusively for us by British heritage brand Diamine, a company that has 150 years experience in the production of inks. *Tax-free shopping (non E.U. delivery addresses): VAT will not be applied at checkout. Please see our FAQ for details. USA orders include import duties and fees (shown separately during checkout).