A properly built light box is the best solution but sometimes we have to make do with what we have. The wall might work, the trick is to make sure it is evenly illuminated or else you will induce gradients into your images. You could take them of an afternoon before u start? What i said about after is best case but even illumination is more important. Just remember to point away from the glow of the sun otherwise the flats will be brighter on one side than the other, and once again induce gradients. All I can say is try it and see how goes. Good luck and let us know.
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