New York, Industrial Publication Company · leaf 554
ear after the acid had been applied five minutes; Fig. 10, the etching with the lightest tints Fig. 12. é se examinations of the etching, lest the tints are bit too dark. In order to effect this, athe i Rete the acid must be poured off, and then the plate carefully washed with water, and dried… … stead of protecting the plate, will rise to the surface of the acid, and the plate will the acid has been applied ten minutes; and Fig. 12 after it has been applied fif- teen minutes. Generally the nitrous acid sold bydrug- gists may be diluted with a little more
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