What's the cost?
The mirror imprint is the same cost as an additional color for standard imprint locations. Setups apply.
The mirror effect requires a second color printed behind the mirror ink in order to display the effect. So any item that uses the mirror effect will need to print at least 2 colors. (The image to the left is using mirror and black imprint colors.)
In addition, item #392 (the 16 oz mixing glass) offers the option of printing on the bottom of the glass. Due to the nature of this printing process along with the location, there is a bottom imprint cost of $1.25(c) for the first color and $0.85(c) for each additional color.