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Watercolour Paper: Thick Rag Sheets Sized with Gelatine
Watercolour paper is heavy rag paper sized with gelatine, so wet paint sits on the surface instead of soaking in. James Whatman made a paper for watercolours this way by the 1780s. The sizing here follows Andrew Ure (1839): dry hand-made sheets dipped in size boiled from skin, with a little alum, then pressed and dried slowly.
Pertengahan
About a week with drying
Arahan
1
1
Make thick rag sheets
Make thick rag sheets
Form, press and dry rag sheets as in the linen-rag paper blueprint, but take up more stuff on the mould for a thicker sheet. Leave them unsized.
2
2
Make the size
Make the size
Melt hide glue in water to a thin size and stir in a little alum. Ure's size was skin boiled to a jelly, which is what hide glue is. Keep it warm, not boiling.
Bahan untuk langkah ini:
Gam kulit haiwan100 g
Tawas (Kalium Alum)10 g
Air2 literAlatan diperlukan:
Cerek Besi
Termometer3
3
Dip the sheets
Dip the sheets
Pour the size into a vat. Spread a few dry sheets out in it at a time so every part is wetted evenly; Ure calls this a nice operation.
Bahan untuk langkah ini:
Kertas20 helaianAlatan diperlukan:
Tong kayu besar4
4
Press, part and dry slowly
Press, part and dry slowly
Press out the spare size between felts, part the sheets, press again and hang them to dry. Dry them slowly: Ure allowed three days.
Alatan diperlukan:
Kepingan kain kempa bulu
Mesin tekan kertas (gaya buku)
Ampaian pengeringan5
5
Press and pick
Press and pick
Press the dry sheets hard and pick out any knots with a small knife. For a smooth (hot-pressed) sheet, press each between smooth pasteboards with a heated iron plate in the pile, as Ure describes.
Alatan diperlukan:
Mesin tekan kertas (gaya buku)
Pisau Kraf
Papan kertas tampal
Plat besi6
6
Limits
Limits
The sizing is Ure's; the size strength (100 g glue and 10 g alum in 2 litres) is ours. Wikipedia lists watercolour paper as hot-pressed (smooth), cold-pressed (textured) or rough, in 90, 140 or 300 lb weights.
Bahan
4- 100 gPemegang Tempat
- Pemegang Tempat
- 2 literPemegang Tempat
- 20 helaianPemegang Tempat
Alatan Diperlukan
9- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
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