an optical acid requires visible sound for mankind to waste
optical_crown is optical_glass. visible_light is non_ionizing_radiation. rales is sound_emission. carbolic_acid is solvent. chlorosulfonic_acid is tangible_thing. sound is sound_property. visible_light is electromagnetic_radiation. autofocus is optical_device. paracrine_signal is tangible_thing. parabolic_antenna is tangible_thing.