... A slight effervescence will now be percievedfrom the battery, and the silver will be deposited upon theDaguerreotype plate, while at the same time a portion of the silverplate is dissolved... 
Henry H. Snelling 「The History and Practice of the Art of Photography」
...Guimet's finest variety, the brilliant ultramarine, acid produceslittle or no effervescence...
George Field 「Field's Chromatography」
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