The ink is part of the season 1 Spaceward series.
Einstein Ring is the bending of light into a ring when it encounters large mass objects in space.
Two bottles of ink in one package - one for daily use (65 ml) and one you can use in your trips or you can simply make a gift (15ml).
Made in South Korea.
Type: Bottled Ink
Season: 1 Spaceward
Surface tension: 65.0 dyne/cm (20'C)
Water Resistant: No
Volume: 65ml + 15ml
Bottle Material: Glass