Method of pinning different kinds of insects. After the insects, have been caught and killed, they should then be prepared for the permanent collection. Most insects such as wasps, beetles, flies and grasshoppers should simply have a pin t... Read more of Pinning And Preserving A Collection at Bugs Insects.netInformational Site Network Informational
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Sorgho Red

Some nine years back there was found to be a carmine colouring matter in
most parts of the Chinese sorgho, chiefly in the unpressed stem. The
red, which is extracted in an impure state, is dissolved in weak
potash-ley, thrown down by sulphuric acid, and washed with water. This
purified product, soluble in alcohol, caustic alkalies, and dilute
acids, has been employed in Austria, Baden, &c., for the dyeing of silks
and woollens with the common tin mordants. The colours produced from it
are unchanged, they say, by warm soapsuds or light. We do not know
whether the red found its way to England, but it has certainly not
appeared here as a pigment.

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Previous: Silver Red

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