What Goes on in these laboratories is called deep reactive-ion etching (DRIE). To begin, a clean silicon wafer, harking back to Terminator 2’s T-a thousand in liquid form and comprised of two layers of mono-crystalline silicon having an oxide layer between, is roofed with a photoresist – a light-sensitive material https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/