>I have installed our new Pocket PC application on customer's Symbol Pocket PC unit. So far all works well. But the customer came across the following situation:
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>They make their own bar code labels (they have some kind of machine for that). And they have a choice of materials, in terms of color, for the labels. They say that the labels made on blue, red, or green materials (where bar code itself is in black) are not read by the Pocket PC scanner. Labels made of white, yellow, and orange materials are scanned well.
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>Is this a typical situation in bar code scanning?

More than likely. Try making a photo copy of the colored labels on a regular copier and you'll see that that background color can be significant.