{TAIL ~ The method} uses NIR spectroscopy and a test element comprising a support, and a substantially constant light path defining layer comprising a diffusely reflecting material that is a) sufficiently porous in all directions as to allow {HEAD ~ a liquid} to spread uniformly in all directions, and b) homogeneously reflects at least 95% of NIR radiation 
{ TAIL ~ The method } uses NIR spectroscopy and a test element comprising a support , and a substantially constant light path defining layer comprising a diffusely reflecting material that is a ) sufficiently porous in all directions as to allow { HEAD ~ a liquid } to spread uniformly in all directions , and b ) homogeneously reflects at least 95 % of NIR radiation
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