An "'etchant "'( sometimes mordant ) is any chemical used to etch, but probably refers to an industrial process.
32.
Etch rate varies based on a number of factors, including the concentration and composition of the etchant, the material to be etched, and temperature conditions.
33.
Splash etching uses a motor-driven paddle to splash boards with etchant; the process has become commercially obsolete since it is not as fast as spray etching.
34.
It has been investigated as an etchant for copper and its complexes, such as Cu ( Hfac ) ( trimethylvinylsilane ) have been employed as precursors in microelectronics.
35.
The ink receives impressions like traditional soft ground, resists the ferric chloride etchant, yet can be cleaned up with warm water and either soda ash solution or ammonia.
36.
A solvent is used to wash away the soft parts, laying bare the underlying material, which is then bathed in or sprayed with the acid or other etchant.
37.
The raised parts and their shoulders are painted with an etchant-resistant material and a pattern of etchant-resistant material is applied to the deep parts of the engraving.
38.
The raised parts and their shoulders are painted with an etchant-resistant material and a pattern of etchant-resistant material is applied to the deep parts of the engraving.
39.
In fact, the only etchant known to be even marginally successful is hydrofluoric acid ( HF ), which etches slowly and predominantly in the direction of the crystal optic axis.
40.
Prepared specimens should be examined with the unaided eye after etching to detect any visible areas that have responded to the etchant differently from the norm as a guide to where microscopical examination should be employed.
