Information is a valuable asset and it's one of the things that doesn't cost you anything. In fact, it is almost thrust upon you - but you can secure more of it with a little effort than by merely being passive.

All information is not immediately useful to you, to be sure, but you can't tell just what particular bit of information that you have stored away may come in handy to-morrow or the next day.

Such books of instruction as the Seed Booklet, Artura Results, Enlarging, Color Plates and Filters, etc., are revised at regular intervals and all the latest information regarding the subjects treated are included in the revised text. Also the most important changes in formula or working methods or information regarding new goods is usually to be found in Studio Light, but the information in its condensed and complete form will most always be found in one of the booklets covering each particular line of goods.

Make it a point to have the latest editions of these booklets on file for reference. The date of revision will be found on the inside cover, or first page and your dealer will be glad to advise you whether or not there is a later edition.

Platinum Papers Discontinued

The manufacture of all of our platinum papers was discontinued June 1st.

For several years the prices of platinum salts had been advancing and even before the outbreak of the war they were about double what they had previously been. At the present time platinum salts are worth over four times the former normal price. Our purchases of platinum made before and soon after the outbreak of the war have, however, enabled us to go along until the present time without raising the price of platinum paper. Our platinum customers have had the full benefit of our earlier purchases.

Paper stock, too, is costing more than it did and the present situation requires either a very large increase in the price of platinum papers, or else the discontinuance of their manufacture. We have decided on the latter course. With the present day quality of developing papers, particularly Artura, few platinum users would be likely to stand for the necessarily large advance in the price of platinum paper. This would mean that the volume of the business would be so cut down that the cost would still further enormously increase. Platinum paper can not be manufactured in the same depart-

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SEED PLATE NEGATIVE, ARTURA PRINT

By H. C. Watton Oklahoma City, Okla.

ment with the gelatine papers. It requires a department of its own and because of these facts it can no longer be made and sold except at a price that seems to us to be prohibitive. We wish we had the platinum in stock so that we could take care of our customers indefinitely at the old prices (we think we did pretty well in keeping them down for nearly two years), but the supply is now gone.

Platinum Papers Discontinued StudioLightMagazine1916 122

PRACTICAL SUGGESTIONS IDEAS THAT HAVE BEEN TRIED BY PHOTOGRAPHERS AND FOUND TO BE USEFUL

When making up a solution from a written or printed formula, it is a good plan to write the entire formula on the label of the bottle. When this is done the formula is always at hand when a new solution has to be made. If the label is varnished with ordinary negative varnish it will last a long time.

It is very difficult to focus an interior when the light is weak. By oiling the ground-glass the brilliance of the image is increased by about four times and much of the difficulty is removed. When exposure is judged by the ground-glass illumination the increased brilliance must not be forgotten in making the calculation.

Many photographers who have bought good anastigmat lenses stop them down to an unnecessary extent when using them for work other than portraiture. Stopping down to f 45 and f.64 may have been necessary with the older types of lenses but a much larger aperture may be safely used with the highly corrected lenses of to-day. An hour or two may be profitably spent in making a set of comparison negatives from the one original. When the results are compared it will be seen that the negatives taken at f.16 or f. 22 are quite as good as those taken at the smaller apertures. The time taken in the experiment will soon be made up by the time saved in exposing with the wider aperture.

A small piece of bright metal may be prepared for photographing by holding it in the smoke of burning magnesium ribbon. The deposit of magnesium oxide dulls the surface and is readily cleaned off after the object is photographed.

Use C. K. Co. Tested Chemicals and be certain of your results.

Platinum Papers Discontinued StudioLightMagazine1916 123

SEED PLATE NEGATIVE, ARTURA PRINT

By H. C. Watton Oklahoma City, Okla.

Platinum Papers Discontinued StudioLightMagazine1916 125

Pleasing others is more than sentiment - it's almost an obligation.your family and friends want your photograph.Make the appointment to-day

THE PYRO STUDIO

Platinum Papers Discontinued StudioLightMagazine1916 126

FROM AN ARTURA IRIS PRINT

By Edward H. Weston Tropico, Cal.

STUDIO LIGHT INCORPORATING THE ARISTO EAGLE ESTABLISHED 1901 THE ARTURA BULLETIN ESTABLISHED 1906 Vol. 8 JULY 1916 No. 5