To help compile a list of the best SPFs for every skin tone and need, we spoke with a dermatologist who explained the active ingredients in mineral sunscreens, plus the best picks to shop.

The semiconductor used here is zinc oxide (zincite), which is obtained by taking a strip of zinc and heating it with a blow torch. This creates spots of zinc oxide on the strip, which can then be ...

When solid zinc is placed in Cu2+ solution, the blue color of the solution becomes less intense as Cu2+ is reduced to copper metal. Orange copper is visible on the surface of the zinc. When solid ...