If your laser printer doesn't print dark enough for quality positives, try lightly spraying your Laser Printer Film with Casey's Ultra Black Toner Enhancement Spray prior to printing in order to darken the laser printer output.
This toner enhancement spray will dissolve the toner and cause the toner particles to fuse together, making the black toner more opaque. Casey's Ultra Black Toner Enhancement Spray is virtually invisible, leaves no residue, and only affects the toner areas.
Note: Casey's Ultra Black is prohibited for export. This product cannot ship outside the contiguous United States. We apologize for any inconvenience.