The 3 Oysters Hun Min Jeong Eum ink feature common color but touching a sense of Oriental and Korean. Hun Min Jeong Eum is the original name of a Korean script called "Han-gle" published in 1446 by the great king Sejong.
Like other 3 Osyters inks the Hun Min Jeong Eum inks each represent something:
Black = Teach
Cobalt = People
Jade = Correct
Scarlet = Sound