How we scored it
Ag 107.9 + NO3 62.0 = 169.9, both mineral-derived (silver ore; nitrate nitrogen and oxygen from air). 169.9 / 169.9 = 1.0.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.
Where it comes from
Refined silver metal from ore is dissolved in nitric acid and crystallised as the salt. The nitrate keeps only nitrogen and oxygen atoms, so no fossil carbon or hydrogen remains.
In plain English
A silver salt used in gradual hair-darkening products, where silver builds up on the hair as a dark deposit. It is made by dissolving refined silver metal in nitric acid.
Structure
silver nitrate
References
- 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
- 2Silver Nitrate. PubChem CID 24470. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
- 3SILVER NITRATE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
- 4SILVER NITRATE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=SILVER%20NITRATE