Are you tired of converting your images to black and white only to find color casts in your prints when they come back from the lab?
This series of commands will result in black & white prints that have no color casts to them because you are deleting all color information before printing.
Open an Image and go to Image>Mode>Labcolor.
Under the Channels tab, delete channel b. Delete Alpha 2 channel.
Convert Mode to Greyscale. Image>Mode>Greyscale.
Convert Mode back to RGB color so the lab can print it Image>Mode>RGB Color.
That's it! Simply write an action for this and you can convert files to black and white with the push of a button!