It was found that the color fading rate of a photochromic film is accelerated when it is exposed to an acoustic field. The investigation of the effect was made with acoustic waves both in water and in air. This newly found effect was utilized as a novel means of mapping an acoustic field. It was shown that the effect can be used to map not only acoustic waves in a liquid, but also acoustic waves generated on the surface of an ADP (ammonium dihydrogen phosphate) crystal. In addition, an acoustic hologram of a small object in water was recorded using this effect.