How to tell b&w image from color?

Sounds spectacularly dumb, I know, and maybe it is, but here goes:
I have been scanning old b/w photos as color for a book; however, I believe that when I wasn't paying attention, a handful were scanned as b/w. How can I tell whether they were scanned in color or in b/w, in which case I'll have to rescan them?
flat-screen iMac Mac OS X (10.4.4)

Hi Eliot,
I don't understand why you would want them in RGB. A b&w photo is just that, b&w. Having it in RGB is still b&w (all pixels with identical values in each channel). The only thing you succeed in is tripling the size of each image by having them in RGB rather than grayscale.
Then there's the problem of RGB when it comes to printing. I'm talking about professional publication here, not ink jet or laser prints. If you convert a b&w file saved as an RGB file to CMYK, most of the color will be converted to the CMY channels with a minimal black. This causes huge headaches on press. Any slight variation of ink on paper will cause the images to shift blue, pink or green depending on which of the CMY inks go off balance during the print run. You are far better off saving b&w images as grayscale. Both for printing and saving space on your drive. A grayscale image will print as black only. With no problems of color shifting as would happen if separated as a CMYK image.

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