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In 1970s SANDOZ AG, Basle/Switzerland distributed a series of interesting paper samples to their customers. No 29 contained the sheet illustrated in the attached file.
Sheet size 970 x 640 mm Wt 16.60g Avg. substance 10 g.m-2
Supporting Text:
The fibres obtained from the inner bark of the paper mulberry tree (kozo, broussonetia papyrifera) are boiled with caustic soda and then bleached with chlorine. “Nori” slime, a juice from the roots of the manapaculi tree, is added to the vat to keep the long fibres in suspension.
First a thin sheet of paper is moulded and couched on a cotton cloth and the pressed butterflies and plants are placed by hand onto the sheet. A second sheet is moulded arid all the fines and short fibres are lightly sprayed off. Then it is couched over the butterflies like a fine net and covered with another piece of cotton cloth to prevent it from sticking to the next sheet.
When a pile of sheets is finished they are pressed in a hand press. The sheets are then brushed onto a steam-heated plate to dry, using a diluted starch solution as an adhesive.
The making of butterfly paper is included in the SANDOZ film “Traditional Chinese Hand Papermaking Today”.First file – small pdf, Second – greater detail of surface pictures
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