I usually set my white balance to "shade", which filters out some of the blue, but then shift the color spectrum to a red filter. Either way, you need to pass the image through some sort of red filter. The other option, if you have photoshop, is to "remove a color cast". It will ask you to select an object that is supposed to be white and then do the work for you by auto-correcting the image.
Can't do any of the above? Then see if your camera has manual white balance. It will ask you to focus on something white (like your substrate) and then adjust your white balance accordingly.
ISO can depend. Since you're trying to capture a pic as fast as you can in a reduced light setting, I usually up my iso so I can set my shutter speed to a fast setting. A high ISO can give you a faster shutter speed, but add a lot of grainyness if you want to enlarge the pic.
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