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To Varnish a Negative

The varnish (see No. 3153) is flowed on and off preparation of collodion the proportion of 1 precisely as with the collodion. (See No. grain of the exciting salts (in each ounce of 3143.) It should be again slightly warmed collodion), to every 10 grains of silver in the to prevent the varnish from chilling or bloom- bath. To illustrate: If the silver bath soluing. When dry, which will be in 5 to 10 tion is at 50°, or, more definitely, 50 grains of minutes, the negative is ready for use as de- silver to each ounce of water, we would make scribed in Nos. 3135, &c., using the negative instead of the leaf. Should the image have evidence of full exposure by the existence of all the proper detail, and yet want vigor or intensity, this may be imparted, before varnishing, by re-development.