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Published online by Cambridge University Press: 25 January 2017
In the course of certain investigations on the identification of cloth ash, it became necessary to develop a technique whereby relatively large (5 to 15 cm.) fragments of ashed cloth of all types woven from vegetable fiber could be permanently preserved.
The requirements were that the preparations should be capable of withstanding the relatively rough handling of the laboratory. They should show the textile remains displayed flat with the yarns of the warp and weft in their original relations.
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197 Powdered rosin, as commonly met with in commerce, is so frequently of inferior quality that the product is nearly always cloudy. Much of the commercial rosin powder has been found to contain talc, powdered gypsum or kaolin.
