How to Print in Color
Printer pr1424c is a color printer. It sometimes prints transparencies, so you may need to change the options.
Using lpr
Run
$ lpoptions -P pr1424c -l
This lists all options for the printer, with the currently selected options marked with a *. If it shows the following line, everything is fine:
InputSlot/Media Source: *Paper Transparency Upper Middle Lower ManualPaper ManualTransparency Auto
But if it shows the following line, the printer will print to transparencies:
InputSlot/Media Source: Paper *Transparency Upper Middle Lower ManualPaper ManualTransparency Auto
In the latter case, run the following command:
$ lpoptions -P pr1424c -o InputSlot=Paper
Using a gui
From the print dialog, you can sometimes select the paper tray from the printer options.