Printing on pre printed paper - problem

[Over Clocker]

Hi guys,

We've just bought a new colour laser printer, and our office prints our letterhead on it, and then keeps this pre printed paper in their mono laser printer to print letters etc.

When they do this, they get a faint imprint of the original letterhead down the page, getting fainter each time!

Any ideas how to solve this one?

Thanks,

Mal