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2. Chemical milling - Wikipedia

   en.wikipedia.org/wiki/Chemical_milling

   An etched and partially russeted and gilded half armor made of steel, brass, leather, and textiles. Organic chemicals such as lactic acid and citric acid have been used to etch metals and create products as early as 400 BCE, when vinegar was used to corrode lead and create the pigment ceruse, also known as white lead. [4]

3. Etching - Wikipedia

   en.wikipedia.org/wiki/Etching

   ferric chloride may be used for etching copper or zinc plates, whereas nitric acid may be used for etching zinc or steel plates. Typical solutions are 1 part FeCl 3 to 1 part water and 1 part nitric to 3 parts water. The strength of the acid determines the speed of the etching process. The etching process is known as biting (see also spit ...

4. Phosphate conversion coating - Wikipedia

   en.wikipedia.org/wiki/Phosphate_conversion_coating

   Phosphate conversion coating is a chemical treatment applied to steel parts that creates a thin adhering layer of iron, zinc, or manganese phosphates to improve corrosion resistance or lubrication or as a foundation for subsequent coatings or painting.

5. Etching (microfabrication) - Wikipedia

   en.wikipedia.org/wiki/Etching_(microfabrication)

   Etching tanks used to perform Piranha, hydrofluoric acid or RCA clean on 4-inch wafer batches at LAAS technological facility in Toulouse, France. Etching is used in microfabrication to chemically remove layers from the surface of a wafer during manufacturing. Etching is a critically important process module in fabrication, and every wafer ...

6. 13 Best Drugstore Primers ELLE Editors Use to the Last Drop - AOL

   www.aol.com/lifestyle/13-best-drugstore-primers...

   There are a lot of great drugstore primers that'll help your makeup look better for longer. Here, ELLE editors reviewed their 13 favorite drugstore primers.

7. Photochemical machining - Wikipedia

   en.wikipedia.org/wiki/Photochemical_machining

   Photochemical machining (PCM), also known as photochemical milling or photo etching, is a chemical milling process used to fabricate sheet metal components using a photoresist and etchants to corrosively machine away selected areas. This process emerged in the 1960s as an offshoot of the printed circuit board industry.