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Small symbols pack in additional information: solid/liquid/gas, the color of an element, common in the human body, common in the earth's crust, magnetic metals, noble metals, radioactive, and rare or never found in nature. It does not overload kids with a lot of detailed numbers, like atomic weights and valence numbers.
At last count 95/97 of the 97 elements (hydrogen through einsteinium, except astatine and francium) isolated in pure form and in macroscopic quantities have images. There are few images of very low encyclopedic quality for which it should be relatively easy to obtain higher quality: N (liquid), Ca. Some elements are still missing images: Pm, Rn.
Sunscreen is regulated as cosmetic product under the State Food and Drug Administration (SFDA). The list of approved filters is the same as it is in Europe. However, sunscreen in China requires safety testing in animal studies prior to approval. [163] Australia. Sunscreens are divided into therapeutic and cosmetic sunscreens.
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The FDA, which regulates sunscreen as a nonprescription drug, asked sunscreen makers in 2019 and again in 2021, to provide more safety data on 12 common ingredients so that they can have GRASE ...
Due to toxicity and environmental concerns, the percentage of sunscreen products on the market containing oxybenzone in the USA dropped to 13% in 2023 from 60% in 2019. [16] Some brands market their sunscreens as "oxybenzone free" [ 17 ] due to the generally negative perception of benzophenones by both the consuming public and scientific ...
Within mineral sunscreens, Spilman also advises using cream-based lotions or sunscreen sticks; while zinc oxide and titanium dioxide do not absorb into the skin like chemical sunscreen, aerosol ...
Avobenzone in sunscreen may stain clothes yellow-orange and make them sticky if washed in iron-rich water, as it reacts with iron to produce rust. The damage can be undone with a rust remover or stain remover. [34] [35] The staining properties of sunblock made with avobenzone are particularly noticeable on fiberglass boats with white gelcoat.
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