COMPOUNDS TO CHANGE COLOR WITH ENVIRONMENTAL CHANGE.
Final technical rept.,
KRUEGER (JOHN W) RESEARCH LAB MADISON WIS
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Some classes of photochromic compounds and processes were studied and of these anils were of most interest for our immediate camouflage purpose. One compound, among many prepared and studied mostly anils gave us a new conception of an automatically changing camouglage in which changes would take place in seconds or less. This known dianil of meta phenylenediamine and salicylaldehyde I was previously reported to change from yellow to orange. The changes from sunlight to shade were in seconds or less and thus the original concept that camouflage color changes would take minutes, hours or overnight was abandoned. I was of further interest because of its resistace to fatigue during a summer of natural sunlight exposure. I was also shown to have not only the known changes from yellow to orange but in intensified sunlight the compound changed from orange to red and reverted as illumination decreased. Author