The ink is part of the season 3 Multiverse series.
Schrodinger & Cat is a thought experiment described as a paradox devised by Erwin Schrodinger.

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.

Technical aspects:

Brand: Colorverse
Type: Bottled Ink
Season: 3 Multiverse
Color: Schrodinger - Green / Cat - Blue
Shimmer: Schrodinger - No / Cat - Yes 
Sheen: No
Shading: No
Surface tension: Schrodinger - 64.0 / Cat - 40.0
Ph: Schrodinger - 7.2 / Cat - 8.0 
Water Resistant: No
Volume: 65ml + 15ml
Bottle Material: Glass