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• Glue for Paper and Metal:-   

Glue which will keep well and adhere tightly is obtained by diluting 1,000 parts by weight of potato starch in 1,200 parts by weight of water and adding 50 parts by weight of pure nitric acid. The mixture is kept in a hot place for 48 hours, taking care to stir frequently. It is afterwards boiled to thick and transparent consistencies diluted with water if there is occasion and then there are added in the form of a screened powder, 2 parts of Sal ammoniac and I part of sulphur flowers.