Dry ice blasting can replace sandblasting, steam blasting, water blasting or solvent blasting. Frosted glass is produced by the sandblasting or acid etching of clear sheet glass. The etching was completed using a photoemulsion and sandblasting process. The most abrasive are shot blasting (with metal shot) and sandblasting (with sand). Glass cloth tapes are often used in powder coating and sandblasting operations. It has a much milder abrasive effect than sandblasting. Complete decontamination requires aggressive treatment like sandblasting, or acidic treatment. Modern methods of carving include using computer-controlled rotary bits and sandblasting over a rubber stencil. Ilmenite sand is also used as a sandblasting agent in the cleaning of diecasting dies. This required a major overhaul of the Alpine plant, leaving only the sandblasting machinery intact. The blowing of millions of sharp sand grains creates a sandblasting effect. While sand is generally non-toxic, sand-using activities such as sandblasting require precautions. Another popular chemical involved in an alternate sandblasting technique is Potassium Permanganate or KMnO4. Nothing worked, short of sandblasting to bare metal. They are so powerful that they often blast and erode material (like sandblasting).