The following negative bath will be found excellent, reducing the expense by one-half, and giving negatives of a first-class description, with an entire absence of "pinholes" : -

Silver nitrate .. •• •• 1 oz.

Barytes nitrate...... 1/2 dr.

Potassium iodide .. .. 8 gr.

Water.. ........ 12 oz.

Nitric acid.. Enough to make slightly acid.

The developer best suited to the above is the following: -

Iron protosulphate .. .. 40 gr.

Acetic acid.. ...... 1/2 dr.

Water.......... 2 oz.

Alcohol......(quant. suff.)

Intensify with silver.