Water ... ... ... ... ... 20 ozs.
Sulphite soda ... ... ... ... 650 grs.
Bromide potass ... ... ... ... 10 ,,
Amidol ... ... ... ... ... 50 ,,
Mix in order named. This should be used within four or five days, as it gradually loses developing powers
Synthol. This new introduction by Messrs. Burton & Sons, of Bethnal Green, is an admirable developer for the various bromide papers. We have found the following to be satisfactory.
Normal or Stock Solution.
Synthol ...............30 grs.
Crystallised Sulphite of Soda ... ... 150 ,,
Water ... ... ...... ... 12 ozs.
This solution will keep for several days in an ordinary bottle, or for weeks if in the special vessel described under the heading Atmospheric Action. In many cases it may be used without addition. If, however, there is the slightest tendency towards a fogging of the whites, a little bromide of potassium may be added ; the quantity ranging from 1 to 10 drops of a 10 per cent, solution to each fluid ounce of the developer. No free alkali should be used with synthol.
Clearing and Fixing. The paper having been exposed, and our developer made, we are now ready for the all-important operation of development; but before giving directions for this procedure there are one or two little points which it will be well to explain. It is advisable to have four or five dishes, and the most convenient are the deep porcelain kind. Dishes used for fer?~ous oxalate development must be used for no other purpose ,• dishes which have been used for Pyro, quinoi, eikotiogen, or fixing, must ?wt be used, or stains will probably occur. The dishes must be absolutely clean, and so must the measures and hands. Hypo must not be touched till the whole developing has been done and the developer and developing dish put away. Distilled or clean rain water should be used for all operations prior to clearing, as otherwise a precipitate of oxalate of lime may cloud the prints. After these important points have been observed, the operator may reasonably expect good results, provided the exposure and development are correctly carried out. It is advisable to have four or five dishes, but shift may