 | Samuel Frederick Gray - 1828 - 1118 páginas
...air and moisture. It is esteemed of good quality when, on breaking a piece, if is hard, solid, and has some reddish and light blue shades running through...glass- makers. By dissolving a little of it in water, it can be ascertained whether it is adulterated by sand, mortar, or stones; though it is impossible... | |
 | Samuel Frederick Gray - 1830 - 480 páginas
...air and moisture. . It is esteemed of good quality when, on breaking a piece, it is hard, solid, and has some reddish and light blue shades running through...is unfit for making ley, though it may be of use to glassmakers. By dissolving a little of it in water, it can be ascertained whether it is adulterated... | |
 | Luke Hebert - 1835 - 938 páginas
...breaking a piece, it is hard, solid, and has some reddish and light blue shades miming through it. \Vheu it has none of its peculiar salt taste, it is unfit...making ley, though it may be of use to glass makers. KERMES, is an insect found in many parts of Asia and the south of Earopc. On account of their figure... | |
 | Luke Hebert - 1836 - 942 páginas
...time of shipment. Kelp is esteemed of good quality when, on breaking a piece, it is hard, solid, and has some reddish and light blue shades running through...making ley, though it may be of use to glass makers. KERMES, is an insect found in many parts of Asia and the south of Europe. On account of their figure... | |
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When estimating the quality of kelp, the early merchants had to rely upon rule-of-thumb methods. 'It is estimated to be of good quality', says Angus Beaton, 'when on breaking a piece, it is found to be hard, solid, and resembling good indigo, that is,... 