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But eight quarts of juice from ripe apples called orange, which was evidently acid, as it curdled milk and reddened infusion of turnsole and that of violet, were treated with four drachms of chalk and the white of an egg: it yielded twenty-two ounces of syrup, between thirty-two and thirty-three degrees of the hydrometer, which did not curdle milk.
It appears that the Florentines were not satisfied with keeping the preparation of orchilla a mystery from the rest of the world, but that they endeavoured to lead all inquiry into a false channel, by calling it tincture of turnsole, desiring it to be believed, that it was an extract from the heliotropium or turnsole: the Dutch also disguised it in the form of a paste, which they called lacmus or litmus.
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