XIV. APPARATUS AND CHESTS. 511 



five times more, after which, two coats are given it of a solution of 

 tereb. Chia 4 oz., in tinct. benz. 6 oz., which renders it less liable 

 to crack; but some finish it with a simple tincture of black bals. 

 of Peru. — 2. Isinglass 4 oz., tinct. benz. comp. 1 oz., water 2 oz. 

 — 3. Ichthyoc. finely shred, benzoin, styr. bals. ana 5], S. V. R. 

 3viij ; dissolve, and while warm spread over the strained silk three 

 or four times : if it become too thick add a little S. V. R. — 4. 

 Mucil. g. tragac. ^ij, Bals.Peruv. 5J ; mix, and spread as before. 

 — 5. Instead of black silk, spread the composition upon goldbeat- 

 ers' skins. 



Bleached sponge, Spongia dealbata. Soak the sponge in 

 very dilute muriatic acid to get rid of any chalky matter it may 

 contain, then in cold water for five or six days, changing the water 

 frequently, and squeezing the sponge well each time. Soak it in 

 sulphurous acid for a week, changing the acid frequently, wash it 

 well, and scent it with rose water or orange flower. 



Spanish wool, Bezetta rubra, B. di Levante, Separate the 

 colouring matter from safflower, as in making rouge ; using white 

 crape to take the colour from the second solution in subcarbonate 

 of soda water : used to colour the cheeks by rubbing the wool upon 

 them. 



FOR THE KITCHEN. 



Claret rags, Toumesol en drapeaux, Bezetta ccerulea. Linen 

 coloured with Auvergne archel : used to colour jellies and confec- 

 tionary. 



Common claret rnga. Linen dipped in juice of blood- red grapes, 

 or in juice of mulberries, or in lees of red and claret wine; ex- 

 ported from France : used to colour the rind of Dutch cheeses. 



FOR USE IN THE ARTS. 



IJtmm pnppr ; — Turmeric paper ; Reddened litmjis paper ; — 

 Perfumed cherry juice paper ; — Mallow flower paper; — Elderherry 

 paper ; — Elderherry paper altered hy ammonia ; — Blue litmus paper ; 

 — Brazil wood paper ; — Brazil wood paper altered by alkalies ; — 

 Juice of huckthorn paper. Are all made by staining paper with 

 the infusion of the several substances. 



Paper stained with alcoholic extract of the yellmv powder at the hot^ 

 torn of dahlia petah ; — Acetate of lead paper ; — Subacetate of lead 

 paper ; — Proto-sulphate of iron paper. Are made by staining 

 paper with the M)iuiionsof the several substances in water. All of 

 these are used as tests for discovering acids, alkalies, sulphur and 

 other ingredients in comp)unds, or for ascertaining the point of 

 neutralization in compounding acids with alkalies or other bases: 

 those of litmus, litmus reddened, and turmeric, are the most 

 in use. 



