You mean if the spectrophotometer pass the patches in a slightly
different path, between the two measurements? Yes, that could
introduce errors due to non-uniform patches. This could be eliminated
using perfectly uniform test patches.
You would have to use something like a Ceram tile, I imagine that
there is a larger error across a printed patch than there is between
readings of most spectros.
If you repeatedly measure the calibration tile (it will hold the
spectro in the same place) it will show you the measurement
repeatability error (for that particular colour).
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