Xiao Hong is a photography enthusiast. She discovered that when black and white photos were developed in a darkroom, the liquid tip of the thermometer used was blue instead of the usual red.

Because the darkroom safety light is a red light, red and white objects can reflect red light and appear red; objects that are not red or white absorb red light, no light is reflected, and all appear black.

If the liquid column of the thermometer is red, the liquid column will be red under the illumination of the safety light in the dark room. Most other objects will also appear slightly red, so the liquid column will be difficult to see clearly. If the liquid column of the thermometer is basket-colored, the liquid column will be black under the illumination of the safety light in the dark room, so we can see it more clearly. Therefore, statement ABC is correct and statement D is incorrect.

So choose D.