The last step of this test is judging the highlights of your key print. The procedure for this part of the test is to increase or decrease the development time of your duplicate test rolls or sets until you find the exact time that will allow your key frame to print well on a normal grade of paper. This will work only if the contrast of the test subject was Normal to begin with.

Refer to your sketch to see which areas fell on Zone VII. If the Zone VII areas of the print you selected for the best shadow values (again, refer to your sketch) are light gray and detailed to your satisfaction, then the amount of time you developed that negative is your new Normal Development Time. Congratulations! If the highlights of your key print are too dark, develop your second roll for 20 percent more time than you developed the first roll.

Note: Increasing the development time will slightly increase the density of the negative's film base. For this reason, a slightly longer SPT may be needed to keep the shadows from printing too light. If an extreme increase in the development time is required, you may be able to move to the next higher ASA number.

Sheet-film users should develop all six sheets of set B in spite of the fact that you are interested in only one key frame. It is important that you keep constant the number of sheets being developed in a given quantity of developer.

If the highlights of your test print are too white, develop set B or your second roll of film for 10 percent less time than the first set. Make a print of the key frame.

At this point, you should be very close to having a perfect print. If for some reason you're still not satisfied with your results, you still have two identical sets of test film with which to work. By continuing this process, you will eventually end up with a good print that will embody your new working ASA and Normal Development Time. These will apply whenever you use that combination of film and developer to make prints of any size.

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