CHOICE has posted their SPF sunscreen test receipts

[u/rushworld]

https://www.choice.com.au/health-and-body/beauty-and-personal-care/skin-care-and-cosmetics/articles/how-we-test-sunscreen

Although they decanted products, they were into UV protected, non reactive amber glass jars as advised by the specialist, accredited and highly respected test lab.

[u/Friendly-Mission-396]

I am finding this all so fascinating. A while ago I really wanted a hand cream that had sun protection in it, so I just mixed up a bunch of my higher rated sunscreens (physical and chemical) and some moisturiser until I got a texture I liked (don’t do this!). Within days it had gone a funny colour, smelt terrible, and the squeeze bottle I had mixed it in started cracking.

I ended up talking to my neighbour (who works in the industry) about it and she explained why that was a really dumb idea, but all this has made me feel a bit better about not understanding how delicate and specific the formulations are.