We are unable for the present to supply Elon. In anticipation of the now existing conditions, we have been experimenting for some time with a developer to satisfactorily take the place of Elon. After a series of most careful tests, which show that excellent results can be obtained with Roylon or Ortol in connection with Hydrochinon, we recommend the following formula:

Roylon-Hydrochinon Formula

For Studio work where a soft working developer is desired for Artura or Azo.

Roylon ....

15

grains

E. K. Co. Sulphite of Soda . . .

190

''

Hydrochinon . .

45

''

E. K. Co. Carbonate of Soda . .

160

''

Sat. Sol. Bromide of Potassium . .

10

drops

Water...

20

ounces

For Amateur finishing or similar work where a contrasty developer is desired, use 4 drops of Saturated Solution of Bromide instead of 10 drops, and 10 ounces of water instead of 20 ounces.

Metol, when obtainable, can also, of course, be used in place of Elon, and there are doubtless some small lots still to be had. We consider it fortunate, however that so satisfactory a substitute as Roylon has been found and that we are in a position to furnish it, although even with the Roylon we are obliged to stipulate, as we have on most chemicals during the past year, "orders accepted for limited quantities only," and you should not object when your dealer makes the same stipulation. His object will be to keep all his customers supplied with chemicals for their immediate use and give them the advantage of the best market prices.

For the present, Roylon will be supplied in only one and four ounce containers for which the prices at present are: 1 oz. bottle, $.88; 4oz. bottle, $3.24.These prices, of course, are subject to change without notice.

Everybody interested in the photographic business should do his part toward the conserving of the supplies of photographic chemicals. One good way is to use and urge the use of Pyro as a developer for plates and films. It's a good developer anyway, and there does not seem to be any danger of the supply becoming exhausted.Use Eastman Permanent Crystal Pyro - the chemical in its most convenient and economical form.

Roylon Hydrochinon Formula StudioLightMagazine1915 239

FROM AN ETCHING BLACK PLATINUM PRINT

By Eugene R. Hutchinson Chicago, III.

For Christmas - your photograph. It carries the personal thought of the giver, is simple, appropriate and creates no greater obligation than the kindly thought it bears.Make the appointment early.

THE PYRO STUDIO

Roylon Hydrochinon Formula StudioLightMagazine1915 241

No. 219. Trice, 30 cents.

Roylon Hydrochinon Formula StudioLightMagazine1915 242

FROM AN ARTURA IRIS PRINT

By Frank Scott Clark Detroit, Mich.