oily patches) directly facing the flash, without any flashback-causing ingredients. The harsh, front-on, white light of a flash is already pretty notorious for causing white patches on any mildly reflective surfaces (e.g. It’s also fantastic for diffusing light – all the tiny surfaces scatter light at different angles, giving a blurry, matte texture, making your skin look flawless on HD video (hence the HD label). This means that it’s great as a microscopic sponge for soaking up oil (kind of like activated charcoal but colourless). (Note: silica is not the same as silicon and silicone!) The silica used in makeup is fumed silica, a type of amorphous silica which has been processed to give it a large surface area. The harsh white markings are caused by silica, an ingredient in many translucent powders, particularly those labelled as “HD”. 3 Things that don’t work well What causes make-up flashback?
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