This section is from the "Studio light a magazine of information for the profession 1918" book, by Sara F. T. Price. Also see Amazon: Studio light a magazine of information for the profession 1918.
The negatives will show the results of under and over-development and the importance of proper strength of developer for the best results. It can also be explained that the properly exposed but under-developed negative can be successfully intensified because it contains full detail, while an under-exposed negative can not be materially benefited by intensification because it does not contain the necessary detail.
We think the next lesson is most important because too little attention is often given to temperature of solutions and the important relation temperature bears to good results. The first of the remaining three negatives should be developed for five minutes in normal developer at a temperature of 50 F., the second for five minutes at 65° F., and the third for five minutes at 75 F.Whether the tray or tank method is used in your work the temperature of the solution is of such great importance in the quality of results and their uniformity, that you should impress this point firmly on the mind of of the apprentice, and yourself as well if you have grown careless.
As temperatures drop below normal the quality of results also drops and the negatives developed at the low temperature will be decidedly weak and lacking in contrast and brilliancy. The reverse will be found with the negative developed at the high temperature. The negative will be hard and contrasty and a poor printer.
With such practical instruction and a little coaching you can, in a very short time, make a good dark-room man of an assistant who might otherwise spend months in picking up the information in small bits. You will also find that the interest you have taken in the boy will be more than offset by the interest he will take in his work if he has any ambition to learn. If you find he is not apt in learning, you can be rid of him much sooner and find more suitable material to develop.
Make the print on ARTURA Pictures of home folks inspire our Soldiers of Democracy with the courage that wins.
Your photograph for your soldier.
There's a photographer in your town. THE P. Y. RO STUDIO
FROM AN EASTMAN PORTRAIT FILM NEGATIVB
General Electric Co. Schenectady. N. Y.
STUDIO LIGHT INCORPORATING THE ARISTO EAGLE ESTABLISHED 1901 THE ARTURA BULLETIN ESTABLISHED 1906 Vol. 10 MAY 1918 No. 3