To make a negative of a subject containing many colors and from this negative to make a print that will accurately record the luminosity or light reflecting value of each color is simplicity itself.

We believe this statement will be challenged by every photographer whose pictures have always represented red and orange (bright colors) as black, and blue and violet (dark colors) as white, so we will undertake to explain, in simple, non-technical language, how these results can be obtained.

It is well known that ordinary plates are over-sensitive to blue and violet, under-sensitive to yel-low and orange and almost wholly insensitive to red. Their rendering of color values is but slightly improved by using a color screen or filter.

Orthochromatic plates are more uniformly sensitive to colors and their rendering of color values is greatly improved by the use of a suitable filter. But neither orthochromatic plates nor ordinary plates can render the color value of red, whether used with or without a filter.

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By A. R. Lindstedt Los Angeles, Calif.

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Wratten & Wainwright Panchromatic plates are sensitive to red and all the other colors of the spectrum and they will perfectly render the value of every color when used with a Wratten & Wainwright K 3 Filter. They will also, when used with Wratten & Wainwright Contrast Filters, render remarkable tonal contrasts between different colors, whether these colors have about the same or different light values.

Since every photographer possesses, or can readily obtain from his dealer, a copy of the Seed Dry Plate booklet, whose cover shows the colored labels used on the boxes of the various brands of Seed plates, we have used this for the subject of our illustrations, that the photographer may see, by comparing these multicolored labels with our illustrations, the remarkable results obtained by photographing colored objects through Wratten & Wainwright Filters on Wratten & Wainwright Panchromatic Plates.

In making these comparisons it should be remembered, however, that our illustrations are half-tone reproductions, which cannot render all the detail of the photographs from which they were made. It should also be borne in mind that the cover of the Seed booklet contains eight colors, each of which was printed separately, and it is inevitable that there should be some variation in the depth of the colors on different covers.

We must also call attention to the fact that the only blue our subject contains is in the banner suspended from the arrow and in the space between the marginal designs on each side of the cover. The dark color in the 27 Gilt Edge, the C Ortho and the 23 labels is not blue but a purple-black.

With the exception of plate 1, all the illustrations are from Wratten & Wainwright Panchromatic Plates.

Plate 1 shows the results obtained when an ordinary plate is used. It will be seen that the orange and yellow are rendered dark, the red nearly black and the blue is rendered white.

In plate 2, made with a Wratten & Wainwright Panchromatic Plate, without a filter, the superior rendering of the yellow and orange is evident, while in plate 3, which represents the results obtained when a K-3 (yellow) Filter is used with the Panchromatic Plate, we have the correct rendering of the light values of all the colors.

Plate 4 shows that a strong yellow filter will render yellow as white and represent orange and green as light colors.

Plates 5, 6 and 7 illustrate the remarkable results obtained when contrast filters are used.

Plate 5 shows that an orange-red filter will render red, light, orange, still lighter, yellow as white, and blue-green, dark, while plate 6 shows that a deep red filter will render yellow-green a light tone; and yellow, orange and red, a pure white.

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PLATE 1 Seed 23 Plate without Filter

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Wratten & Wainwright Panchromatic Plate without Filter

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Wratten & Wainwright Panchromatic

Plate K-3 (Yellow) Filter

The correct rendition

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Wratten & Wainwright Panchromatic Plate G (Strong Yellow) Filter

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By A. R. Lindstedt Los Angeles, Calif.

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By A. R. Lindstedt Los Angeles, Calif.

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Wratten & Wainwright Panchromatic Plate A (Orange-Red) Filter

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Wratten & Wainwright Panchromatic Plate F (Deep Red) Filter

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Wratten & Wainwright Panchromatic Plate B (Green) Filter

The green filter (plate 7) renders red as black, blue-green nearly white and green very light.

From what has been shown the photographer can readily see that by using Wratten & Wainwright Panchromatic Plates with a K-3 Filter the correct rendering of color values in photographs is easily obtained, and that by using these plates with the Wratten & Wainwright Contrast Filters, almost any degree of contrast between colors may be produced in the negative.

For landscape work the ortho-chromatic filters should be used. These are known as the K series. The K-l gives a medium ortho-chromatic correction. The K-2 splendidly renders cloud effects and is the one most extensively used in landscape work, while the K-3 gives the full orthochro-matic rendering of all colors as seen by the eye.

In photographing furniture the yellow filters are most satisfactory for oak and other yellow woods, while the A (orange-red) filter is best for mahogany or rosewood, the F (deep red) filter only being used in extreme cases for very dark mahogany.

Any object will photograph on a Wratten & Wainwright Panchromatic Plate exactly as it appears to the eye when viewed through the filter to be used. This makes it a very simple matter to secure exactly the desired result by first looking at the object through the various filters, selecting the one best suited to the purpose.

Contrast Filters for Commercial Photography.Complete set of eight Filters, 3 in. square, cemented in B glass, packed in a neat case, K-l, K-2, K-3, G, A, B, C, F, per set...... $20.00

Set of three Filters, 3 inches square, cemented in B glass and packed in neat case, K-3, G, A, per set ................. 7.50

Separate Filters, any of the above, 3 inches square, cemented in B glass, each ............... 2.50

Use Eastman Tested Chemicals and be certain.