1. Hydrofluoric acid of Porcelain Etchant and phosphoric acid of uni-ETCH are severe eye and tissue irritants.

2. More often , all of the materials etchant have a finite etch rate.

3. Hydrofluoric acid of Porcelain Etchant and phosphoric acid of UNI - ETCH are severe eye and tissue irritants.

4. The feasibility of Confined Etchant Layer Technique ( CELT ) has been studied.

5. For example, an etchant can be applied to the inner surface 450 through a descender (e. g. , descender 130 in FIG. 1A) in the flow-path module.

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6. In this paper, the quick measurement of the copper with dicyclohexanonexalyl dihydrazone (BCO) spectrophotometric method in the process of the overall utilization of waste FeCl 3 etchant was studied.

7. Application: Mainly used in dry cell, electroplating, dye and precision casting, curriery, etchant, feed additive etc.

8. More often, all of the materials exposed to the etchant have a finite etch rate.

9. Perchloride of iron used to etch gravure cylinders. Alernative term: etchant .

10. This is a subtractive process that uses photolithographic techniques to define the aperture pattern, and then applies an etchant to form the apertures simultaneously from both sides of the stencil.