: Sell "30 Volume" developer, which is approximately 9% concentration—significantly weaker than a true 30% liquid solution.

: It is the gold standard for oxidation reactions in lab settings. Users from Home Science Tools report consistent results for educational demonstrations.

: A common source for technical and ACS (American Chemical Society) grade solutions in various sizes, from quarts to gallons. Specialty Chemical & Lab Suppliers :

: High. It is highly effective for removing deep organic stains and treating iron/sulfur in well water systems.

: Known for providing high-purity laboratory grade and food-grade 30% solutions. They ship in sizes ranging from 500mL to 55-gallon drums.