I used it as when I painted the Color Theory Triangle but none of my photos do it justice. It's tricky to photograph as it reflects so much light and so I eventually decided to just show you a photo of it in its jar. (I was perversely pleased to see the color-chart sample on Tri-Art's website isn't a great photo either.)
The word "mirror" does tend to make me think of the reflectiveness of a mirror, but you're not going to get that kind smooth reflection by painting this down with a brush. "Liquid shine" is possibly more apt, but that sounds like a dishwashing liquid.
Besides being a fine silver for where you might want silver, it's interesting to use this as a base color rather than white. After all, with glazing, it's all the layers of paint that make the final "color" as the light travels through and bounces back to your eye. But please don't ask me for step-by-step photos without light reflections in them!
Buy Direct: Liquid Mirror
Image: © 2009 Marion Boddy-Evans. Licensed to About.com, Inc