Note: This text has been automatically extracted via Optical Character Recognition (OCR) software.
Experiments Illustrating The Properties Of Charcoal.
If this black water be evaporated , the black matter will be deposited on the sides of the vessel in the form of a soot , that is , very soft and unctuous to the touch . That these effects are owing to the slimy parts of the honey , seems to be proved by the following experiments : 3 . To a diluted solution of an ounce of gum-arabic was gradually added charcoal powder by pounds ; the mixture was well boiled , and a little of it was frequently filtered for examination . The liquor
, however , constantly ran through the bloating-paper turbid and darkcoloured , till jolbs of charcoal powder , with a proportionate quantity of water for its dilution , had been mixed with it , and then the percolated liquor was clear . The whole of the filtrated liquor was now evaporated , but none of the gum was any longer to be found in it , so that it must have been , decomposed or simply absorbed by the
charcoal . 5 . Charcoal powder has the same effect upon other fluids which contain either vegetable mucilage or animal g luten . The 3 * will not run clear through the filter till they have been completely deprived of their mucilaginous or g lutinous parts , by the addition of a proper quantity of charcoal powder .
6 . Beer , milk , or lemon-juice , mixed with charcoal powder , remain of a turbid black colour , until the latter is added in a quantity sufficient for depriving those fluids of all their mucilaginous , caseous , and oity parts , for which effect those fluids must be diluted with a
prodi g ious quantity of watei * . 7 . From these , facts we may determine a priori , and without having recourse to experiments , the cases in which this clarifying powder of charcoal is not at all applicable : it is not applicable to any of those substances in whose mixtures and composition , oity , gummy , or gelatinous matter constitutes an essential and necessary part . On the other handcharcoal powder may be advantageously empio 3 * ed in all
, those cases in which we wish to separate and remove the abovementioned principles . 8 . Charcoal powder , over which a very emp 3 n eumatic distilled vinegar that has been concentrated by freezing , had been abstracted till the charcoal was become dry , displayed upon its surface all the colours of a peacock ' s tail .
9 . AU sorts of vessels , and other utensils , may be purified from , long-retained smells of every kind , in the easiest and most perfect manner , by rinsing them out well with charcoal powder , after their grosser impurities have been scoured off with sand and pot-ash . 10 . In the common mode of clarifying honey a great deal of scum is separated : from this scum we may obtain honey perfectly pure
and clear , by diluting it with a proper quantity of water , and adding to it , while on the fire , ' as much charcoal powder as is necessary to make it filter clear . The filtrated liquor is afterwards to be evaporated to a proper consistence .
11 . Upon the disagreeable bitter taste of salt water , charcoal has not the least effect . This seems to me to prove , that its nauseous taste is not owing to bituminous matter , but to the earthy neutral salts ; for the charcoal would certainly extract or absorb any bitu-3 F
Note: This text has been automatically extracted via Optical Character Recognition (OCR) software.
Experiments Illustrating The Properties Of Charcoal.
If this black water be evaporated , the black matter will be deposited on the sides of the vessel in the form of a soot , that is , very soft and unctuous to the touch . That these effects are owing to the slimy parts of the honey , seems to be proved by the following experiments : 3 . To a diluted solution of an ounce of gum-arabic was gradually added charcoal powder by pounds ; the mixture was well boiled , and a little of it was frequently filtered for examination . The liquor
, however , constantly ran through the bloating-paper turbid and darkcoloured , till jolbs of charcoal powder , with a proportionate quantity of water for its dilution , had been mixed with it , and then the percolated liquor was clear . The whole of the filtrated liquor was now evaporated , but none of the gum was any longer to be found in it , so that it must have been , decomposed or simply absorbed by the
charcoal . 5 . Charcoal powder has the same effect upon other fluids which contain either vegetable mucilage or animal g luten . The 3 * will not run clear through the filter till they have been completely deprived of their mucilaginous or g lutinous parts , by the addition of a proper quantity of charcoal powder .
6 . Beer , milk , or lemon-juice , mixed with charcoal powder , remain of a turbid black colour , until the latter is added in a quantity sufficient for depriving those fluids of all their mucilaginous , caseous , and oity parts , for which effect those fluids must be diluted with a
prodi g ious quantity of watei * . 7 . From these , facts we may determine a priori , and without having recourse to experiments , the cases in which this clarifying powder of charcoal is not at all applicable : it is not applicable to any of those substances in whose mixtures and composition , oity , gummy , or gelatinous matter constitutes an essential and necessary part . On the other handcharcoal powder may be advantageously empio 3 * ed in all
, those cases in which we wish to separate and remove the abovementioned principles . 8 . Charcoal powder , over which a very emp 3 n eumatic distilled vinegar that has been concentrated by freezing , had been abstracted till the charcoal was become dry , displayed upon its surface all the colours of a peacock ' s tail .
9 . AU sorts of vessels , and other utensils , may be purified from , long-retained smells of every kind , in the easiest and most perfect manner , by rinsing them out well with charcoal powder , after their grosser impurities have been scoured off with sand and pot-ash . 10 . In the common mode of clarifying honey a great deal of scum is separated : from this scum we may obtain honey perfectly pure
and clear , by diluting it with a proper quantity of water , and adding to it , while on the fire , ' as much charcoal powder as is necessary to make it filter clear . The filtrated liquor is afterwards to be evaporated to a proper consistence .
11 . Upon the disagreeable bitter taste of salt water , charcoal has not the least effect . This seems to me to prove , that its nauseous taste is not owing to bituminous matter , but to the earthy neutral salts ; for the charcoal would certainly extract or absorb any bitu-3 F