| Most quality work is carried out in etching machines provided with impellers that break up the etchant into a spray and force it against the plate. |
| Before applying the porcelain primer, phosphoric acid etchant with a cotton pellet should be applied on the base for 60 to 90 seconds. |
| When there is a gap between sample and resin water, alcohol or etchant can bleed out of the gap during drying or even on the microscope. |
| Frequently, poor results are achieved when this etchant is used on mechanically prepared specimens of many aluminium materials. |
| However, the market for NF3 use is growing rapidly, particularly as a plasma etchant and equipment cleaning agent. |
| The immediate application of this etchant to specimens of a number of aluminium materials, in particular the wrought alloys, produced, as expected, unsatisfactory results. |
