These safelights consist of one or two sheets of glass coated with a colored gelatine film, which transmits a perfectly safe light for handling the plate for which they are recommended.

Series 0

A bright orange color suitable for use with Bromide paper and Lantern Plates.

Series 1

An orange safelight for use with ordinary, medium and extra rapid plates which are not color-sensitive. Consists of yellow and orange coated glass, with red paper between.

Series 2

A safelight for extra rapid and Orthochromatic Plates which are sensitive to green but not red. This safelight consists of yellow and violet colored glass with deep red paper between.

Series 3

This is the green safe-light for use with the red-sensitive Panchromatic Plate. It gives a faint illumination, which grows quite strong as the eyes become accustomed to it. This safelight consists of yellow and green coated glass with green paper between.

Series 4

Bright green safelight for use with ordinary plates, for those who are unable to use a red light. Not safe for Orthochromatic Plates.

Series 5

Blue green safelight, which can be used with Orthochromatic Plates if care be taken. Not recommended except where the red Series 2 cannot be used with comfort.

From A Zelta Print By Elias Goldensky Philadelphia, Pa.

From A Zelta Print By Elias Goldensky Philadelphia, Pa.

From A Zelta Print By Elias Goldensky Philadelphia, Pa.

From A Zelta Print By Elias Goldensky Philadelphia, Pa.

Tank Development

One of the leading photog-raphers of the Prairie provinces wrote us the other day that while attending the Eastman School of Professional Photography held last July in Winnipeg, he was surprised to find that so few photographers in that section of the country were using the tank successfully, though the majority have them.

This man uses a battery of seven tanks and claims that they save him the wages of an extra hand.

The three essentials of successful tank development are: cleanliness, good chemicals and pure water.

Dirty Tanks

The tank must be kept clean if you would have it work right. The best way to keep it clean is to wash it out with boiling water when through using and dry thoroughly. Never put your tank away with the inside damp. If deposits appear on the side, they can be quickly removed by using a dilute solution of acetic acid to cut them off.

Poor Chemicals

As in all photographic processes, you must have chemicals of the highest grade. Use chemicals bearing the C. K. Seal.

Poor Water

In March Studio Light, page 8, we give the best method we know to make sure of good water. Remember that organic matter in water means charging the water with gas, and unless this gas is expelled, plates will be affected by semi-transparent spots. Photographers, in Western Canada especially, cannot be too careful of the water used in their work and this is the time to see about it, before the holiday trade begins.