Chameleon Black 2, ODB-2, or Black 2. You state that the product at issue is a type of colorant known as a colorformer. In its supplied state, “Chameleon Black 2, ODB-2, or Black 2” is an off-white colored powder, which when exposed to appropriate acidic conditions, develops a strong black color. Your submission identifies this product’s common commercial name as “OBD-2 or Black 2” and CAS number as 89331-94-2. This product is 99.5%+ pure and primarily used as a coating component in the manufacture of carbonless paper.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N306416