Sailor Colors of Four Seasons Autumn Kin-Mokusei Ink Bottle. Bring back the beautiful colors of Autumn with the new Sailor Colors of Four Seasons Autumn Kin-Mokusei Ink. This beautiful color replicates the beautiful golden-brown color of leaves which we only see in the autumn. The ink is specially formulated to offer smooth and skip less writing. Sailor Kin-Mokusei ink can be used with any standard fountain pen and comes in a 50ml ink bottle with an internal inkwell.