two types of salt: diammonium phosphate ([NH4]2HPO4) and ammonium polyphosphate ((NH4PO3)n).
Along with its use as a fertilizer (providing nitrogen and phosphorous to plants), you often see ammonium phosphate in crystal-making kits that are popular with children.
Phos-Chek doesn’t include any substances flagged by California’s Proposition 65 list of materials that are known to cause cancer and other harms, according to its maker.
