Unlike industry-standard petroleum-based dyes, this organic shirt is dyed with logwood trees and indigo leaves.
Logwood dye is extracted from the heartwood of logwood trees. It has been safely used in Europe since the 1500s, and by the Mayans for hundreds of years before that.
Indigo leaf dye has been safely used for thousands of years (dating back to 2000-3000 B.C.) for its ability to make strong and beautiful blues. In the 1800s, natural indigo was almost completely replaced by synthetic indigo, which is derived from the known toxin aniline (a chemical that has been used to make rocket fuel).