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Open-ink is a project designed to create free, publicly available fountain pen ink formulations that have been created and tested by a community of chemists, artists, engineers, and fountain pen enthusiasts.

Open-ink is a project designed to create free, publicly available fountain pen ink formulations that have been created and tested by a community of chemists, artists, engineers, and fountain pen enthusiasts.

from io9

Feathered costumes change colors in different climates