C.I. Solvent Black 29

C.I. Solvent Black 29 (CAS 117527-94-3) is a solvent-soluble black dye used in penetrating trim restorers to supplement or replace the natural darkening provided by linseed oil oxidation. In Adam's Black Trim Restorer, it appears at 1–5% in a ≥80% boiled linseed oil matrix, providing color depth and a more uniformly black result than linseed oil alone would produce on heavily faded plastic. **Aquatic hazard:** SDS Section 12 for the formulated product classifies C.I. Solvent Black 29 as "harmful to aquatic life with long lasting effects" — LC50 112 mg/L in fish over 96 hours. Chronic EC50 is >1,000 mg/L in aquatic invertebrates. The stay-on-car application pattern (trim restorer is not rinsed off) limits direct waterway exposure during use, but wash runoff over subsequent vehicle washes does carry trace amounts. **Environmental note:** No PBT or vPvB classification — the persistence concern is mild compared to silicone-based or fluoropolymer ingredients. Biodegradation data are not available.