Adjective
countershaded (not comparable)
Having countershading
Camouflage is a soft-tissue feature that is rarely preserved in the fossil record, but rare fossilised skin samples from the Cretaceous period show that some marine reptiles were countershaded. Source: Internet
Self-shadowing makes an animal appear darker below than on top, grading from light to dark; countershading 'paints in' tones which are darkest on top, lightest below, making the countershaded animal nearly invisible against a suitable background. Source: Internet
In aerial photographs, the countershaded gun was essentially invisible. Source: Internet