10 ml Bottled Fountain Pen Ink. 
Test new colors. Very handy when traveling.

 
Eclat de saphir (Sapphire blue): sapphire is a gemstone. The terminology probably comes from 2 origins: the Greek with “sappheiros” (a stone of blue color) or from the Hebrew “sappir” (the most beautiful thing).

Herbin is the oldest name in pen inks in the world. "The Jewel of Inks" was created in Paris in 1700.
Herbin uses all natural dyes in their fountain pen inks. This natural composition is reflected in the very neutral pH of the inks.