A Text-book of Tanning: A treatise on the conversion of skins into leather, both practical and theoretical.Procter, H. R. (Henry Richardson)
Science
A Text-book of Tanning: A treatise on the conversion of skins into leather, both practical and theoretical.
Procter, H. R. (Henry Richardson)
Tanning
────────────┬────────────┬────────────┬─────────┬───────────┬─────────────┐
Reagent. │Myrabolanes.│ Divi-divi. │ Valonia.│ Oak Bark. │Chestnut wood│
────────────┼────────────┼────────────┼─────────┼───────────┼─────────────┤
Boiled with │Pale deposit│Pale deposit│ Slight │Slight pale│ Slight red │
equal volume│ (eliagic │ (eliagic │ pale │ deposit or│ deposit on │
of sulphuric│ acid) on │ acid) on │ deposit.│ turbidity │ cooling. │
acid (1 vol.│ cooling. │ cooling. │ │on cooling.│ │
to 9 vol. │ │ │ │ │ │
water). │ │ │ │ │ │
────────────┼────────────┼────────────┼─────────┼───────────┼─────────────┤
Bromine │ No pp. │ No pp. │ No pp. │ Pale pp. │ No pp. │
water. │ │ │ │ │ │
────────────┼────────────┼────────────┼─────────┼───────────┼─────────────┤
Dilute │Blue-black │Dark blue │Blue- │Bluish │Blue- │
ferric │pp. │ pp. │black pp.│ black pp. │ black pp. │
chloride. │ │ │ │ │ │
Add │Brown pp. │Dark red pp.│Red brown│ Red brown │Dull red pp. │
ammonia. │ │ │ pp. │ pp. │ │
────────────┼────────────┼────────────┼─────────┼───────────┼─────────────┤
Sol. │ No pp. │Faint │ No pp. │ No pp. │Slight │
tartar │ │ clouding. │ │ │ clouding. │
emetic. │ │ │ │ │ │
Add ammonic │Light pp. │Dense pp. │Pale pp. │Whitish │ Pale pp. │
chloride. │ │ │ │ pp. │ │
────────────┼────────────┼────────────┼─────────┼───────────┼─────────────┤
Copper │Faint │Slight │ No pp. │Slight pp. │ No pp. │
sulphate. │ clouding. │ green pp. │ │ │ │
Add │Dense dark │Dense dark │Dark │Brown pp. │Dark │
ammonia. │ pp. │ pp. │ reddish│ │ brown pp. │
│ │ │ pp. │ │ │
────────────┼────────────┼────────────┼─────────┼───────────┼─────────────┤
Lime-water. │Yellow pp. │Yellow pp. │Yellow │Brown pp. │Purplish │
│ turning │ turning │ pp. │ │ brown pp. │
│ greenish. │ purple. │ turning│ │ │
│ │ │ red- │ │ │
│ │ │ purple.│ │ │
────────────┼────────────┼────────────┼─────────┼───────────┼─────────────┤
Ammon. │Dirty │Dark │Dark │Greenish │Dirty │
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