I have bought some sun sensitive paper on Amazon and decided to test ALL my sunblocks.
This paper is "coated with light-sensitive chemicals, which react to light waves and particles when exposed to light."
See this short youtube video, if you have never heard of it: https://www.youtube....h?v=O6_pzu-nJUo
I have tested the following sunblocks:
As you can see, some of them are from Europe (Vichy), some of them are from Japan (Ginza Tomato, Anessa by Shiseido, Astalift by FujiFilm, Laduree, etc.) and others are from the US (EltaMD, Australian Gold, Cotz, MD SolarScience). 2 sunblocks are not in the photo above but in a photo below.
(the BLUER the paper, the better the sunblock)
Experiment I was done without a plastic wrap on top of the paper.
Experiment II was done WITH a plastic wrap on top of the paper.
And this is after sun exposure:
Results:
The best players are:
Astalift by FujiFilm BB cream SPF 50+ PA++++ (good job in both experiments)
Ginza Tomato Camelion BB cream SPF40/PA+++(good job in both experiments)
Australian Gold Mineral Lotion SPF 50 with Zinc Oxide 4% and Titanium oxide 4% (big surprise for me)(good job in both experiments)
The worst players are:
Elta MD Defense SPF 45 (this is the sunblock I have been using for 2 years!!!) Zinc Oxide 9% and 7.5% Octinoxate (poor job in both experiments)
Vichy Bronze SPF 50 (France) (poor job in both experiments)
KOHGENDO SPA SUN PROTECT Watery UV Gel 40g SPF50+ PA++++ (Japan) (poor job in both experiments)
Cotz Sensitive SPF 40 with Zinc Oxide 20% (poor job in both experiments)
Observations:
Some chemical sunblocks (Vichy,Laduree) did a good job in Experiment I and a poor job in Experiment II. I guess that is because chemical sunblocks need to be absorbed by the skin to work. But it does not explain why some physical sunblocks (MD SolarScience) did such a poor job in Experiment II.
Instruments:
Please note I used a lot more sunblock (1/8 tsp on a 2.5-inch circle). It is more than you would use on your face.
