Books › Old Violins And Their Makers, 1883 › scan 318
Scan 318
Old Violins And Their Makers, 1883
4 lines. Read by computer on 27 September 2026. Printed page 304. See the scan on archive.org.
1of the red colours, as otherwise, the essential oils would abandon these to unite with the gamboge and bitumen, for which they have the greatest affinity. It would be better to make this modifying tint separately, in the following proportions: Oxidised essential oil of turpentine, three quarters of a gill, gamboge, reduced to powder, 5 1/2 drachms. This solution should be made at two separate intervals, as before described, and after filtering, add 1 drachm of bitumen of Judea, powdered, and let it dissolve for eight or ten days, then filter through bibulous paper, in order to intercept the little morsels of bitumen which frequently remain in suspension. With this solution you can modify the red colours already referred to, giving them a reddish brown tint. It is not, however, easy to state the exact proportions in which to mix the two coloured essences, as these will depend on taste. It is sufficient to say that the above is the largest quantity of bitumen that you can dissolve in the proportion of essence given, without risking some alteration in the solidity of the reds. In the event of these being too much weakened by the addition of this yellowish brown solution, you can remedy that defect by adding a little of the red essence, until you are satisfied with the tint. There are several bitumens employed in commerce. That called "of Judea" is used for photographic purposes, and should be obtainable without much difficulty.
3These varnish formulas are taken from a brochure by Mr. Mailand, which was laid before the jury of the last Paris Exhibition, and which, when first published, so completely modified the ideas of the late M. Vuillaume in this matter that his indebtedness to these
The computer misreads some letters and numbers. Where a name matters to you, read the scan.