How we scored it
SSr is fully mineral: Sr from celestite/strontianite ore, S from mineral sulfur, combined by reduction → 119.69/119.69 = 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
Strontium sulfide is produced by carbothermal reduction of strontium sulfate (celestite ore) with mineral sulfur or carbon. It is treated as natural-origin under ISO 16128's mineral provisions even though not renewable.
In plain English
An inorganic mineral compound used in depilatory (hair-removal) creams to help break down hair. It is produced from strontium ore and mineral sulfur.
Structure
sulfanylidenestrontium
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.
- 2Strontium Sulfide. PubChem CID 14820. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
- 3STRONTIUM SULFIDE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
- 4STRONTIUM SULFIDE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=STRONTIUM%20SULFIDE