The color change can last for several months, but treatments are available.

Her skin was turning blue now; even he could see the color change.

So the color changes, and we just call that a "physical" change, because our eyes can see it.

Looking down, I saw that a color change had been thrown in for free.

Michael's own eyes were gray, so it wasn't that much of a color change.

If a color change does not occur within three minutes, the result is negative.

The health care provider will look at your skin for any color changes.

The better the cleaner, the less color change, he said.

Researchers have been unable to find the reason for the color changes.

These show through a visible color change if product is still fresh or not.