TWSBI Ink 70ml is another new venture from TWSBI.

Supplied in an attractive frosted glass 70ml bottle, it is available in four colours: Blue, Black, Red and Blue Black.  

The Blue Black is particularly interesting as it is an iron gall ink.  This traditional ink mixes iron and tannin to give a deep dark blue that forms a permanent mark on paper - when dry iron gall ink is wayerproof.