 | Jeremiah Joyce - 1807 - 340 σελίδες
...the escape of the acid of galls. Hence ink stains degenerate into iron-moulds. James. But iron-moulds are produced almost as soon as the linen that has...abundant of metals. The practical knowledge of iron may be said almost to distinguish the civilized from the savage world. CONVERSATION XIV. Of Tin and... | |
 | William Henry - 1819 - 482 σελίδες
...ironmoulds, and these last are immediately produced on an inked spot of linen when washed with soap, because the alkali of the soap abstracts the gallic acid, and leaves only an oxide of iron. (f) Ink is decomposed by oxymuriatic acid, which destroys the gallic acid, and the... | |
 | John Lee Comstock, Sir Richard Phillips - 1822 - 260 σελίδες
...iron-moulds, and these last are immediately produced on an inked spot of linen when washed with soap, because the alkali of the soap abstracts the gallic acid, and leaves only an oxide of iron. Hence also the yellowish colour which is produced by dipping linen into a solution... | |
 | John Lee Comstock - 1825 - 252 σελίδες
...iron-moulds, and these last are immediately produced on an inked spot of linen when washed with soap, because the alkali of the soap abstracts the gallic acid, and leaves only an oxide of iron. Hence also the yellowish colour which is produced by dipping linen into a solution... | |
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Because the alkali of the soap abstracts the gallic acid, and leaves only the oxyde of iron. 