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If that is the only problem with the photo, you can use Photoshop to change the pink to white. You will need to go to Image/Adjustment/Levels. Use the eyedropper on the right to click in the pink space to make that white.
The other option is to see if the bottles are bouncing color on to the white. You may want to tape some white paper to the sides of the bottle (out of camera view) so the bounce is only white.
I assume you mean black and white from Color.
You can use the "hue saturation" panel. Shortcut should be control - u (command - u on Mac) Pull the saturation slider all the way to the left and click OK. Color photos sometimes become a little "flat" when converted to B&W. You can fix this by adjusting "levels". You should find a "auto levels" in your image menu.
You don't need to scan the doc again. If you have a graphics editing program (like Photoshop) you can change the mode to Grayscale and resave it. I bet you by now you probably have rescanned it anyway :)