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mine. Deep blue and deep purple reduce apparent contrast. The purple gave a picture on which it was noticeably hard to focus the eyes satisfactorily. Pale carmine was the first tint run and it afterwards developed that some of the judges had not understood the system on this first color, and through an oversight, this was not run again. This probably accounts for its eccentric behavior.
I. Untinted Light Unreduced
Brightness
III.
INCREASE
NO EFFECT
DECREASE INCREASE
Pale
Pale Yellow
All Others 1
Amber
Pale Lemon
Very Pale Greer
1
Clearness
5 Very red ].
Pale blue
Blue 6
I Blue ;
Grass green
Pale rose
Red blue
Deep blue Deep blue green
Pale amber
Deep carmine
Deep purple
Pale yellow
Deep amber
Deep violet
^Pale bluel
Deep red
Pale lemon
I green j
3 Very pale |
Pale olive
Pale carmine
I green 3
Lemon Contrast
All others
Blue
Deep blue
Red blue
Deep purple 14
Deep violet
Deep red
Deep blue green
—SUMMARYNO EFFECT 3
II. Untinted Light Reduced to
INCREASE
Red blue Pale carmine Deep red Pale amber Pale yellow Pale lemon Lemon Deep amber Very pale green
All others
NO EFFECT
Pale blue Pale rose Deep carmine Pale olive
Deep violet
Deep blue
Untinted Light Reduced to
DECREASE INCRE
Brightness
Very red blue Blue
Deep blue Deep purple Deep violet 9 Grasi green Pale blue green Deep blue green
Clearness
Deep blue
Deep purple
Deep blue green 17 Contrast
Deep purple 19
-SUMMARYNO EFFECT
NO EFFECT
All others
All others
All others
Deep blue Pale carmine Deep blue green
Deep blue Pale carmine
Pale carmine
DECREASE
Brightness
Deep purple
-SUMMARYNO EFFECT
Clearness
Deep purple
IV. Untinted Light Reduced to ^
Contrast Deep purp
17
INCREASE
NO EFFECT
Pale carmine Pale carmine
DECREASE
ightness
—SUMMARYNO EFFECT
DECREASE 17
Clearness
Deep purple 19 1 1
Contrast
Pale carmine
The above results are not complete, as the committee has not yet been able to determine the quantity of light absorbed by the dye, and accordingly the ratio between the actual energy passing through the tinted and untinted films. When this is known, it is expected that the advantage of tints will be still more strongly marked. The committee hopes to have this information by the next meeting of the society.
120