Scientific American 17, 15.1.1848
A continental paper says that one Rydni, proprietor of a great dyeing establishment near Gottenberg, a famous place for dyers, has invented a mode of dying cottons without indigo; the blue colors obtained by the substance employed is said to be as clear and fast as that obtained by indigo, resisting the strongest lye, potash and sulphuric acid, and costs but one-sixth the price.
These are the tests for permanent colors. The process is kept secret, and it if be true in relation to the price the discovery is a valuable one, if not, no depreciation in the value of indigo may be expected.
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