Abstract: This invention provides a photographic element containing a polymer layer which reflects a development inhibitor or its precursor released from a DIR compound thereby retarding the diffusion of the development inhibitor to another layer. The polymers used in the barrier layer contain from about 1.times.10.sup.-5 to about 4.times.10.sup.-3 ion forming functional groups. The preferred polymers comprise repeating units of the formula --(A).sub.m -(B).sub.n -- with A derived from a hydrophobic monomer and B derived from an ionic hydrophilic monomer with the more preferred monomers being acrylates, methacrylates, acrylamides and methacrylamides. The invention also provides a method of processing a photographic element containing such a barrier layer.

Abstract: A multizone element, for quantitative analyte determination in whole blood, containing a porous spreading zone separated from a reagent zone by a barrier zone, said barrier zone comprising a non-porous film comprising a polymer of: from 30 to 95 percent by weight of polymerized monomer having the structure ##STR1## from 0.25 to 30 percent by weight of polymerized monomer having the structure ##STR2## and from 0.1 to 50 percent by weight of polymerized monomer having the structure ##STR3## wherein: R.sup.1, R.sup.3, and R.sup.5 are independently selected from the group consisting of hydrogen and methyl,R.sup.2 is alkyl of from 1 to 16 carbon atoms,R.sup.4 and R.sup.6 are independently selected from the group consisting of alkylene groups having from 1 to 6 carbon atoms, ##STR4## wherein R.sup.7 is hydrogen, alkyl of 1 to 10 carbon atoms, or cycloalkyl of 5 to 10 carbon atoms, andM is NR.sup.8 R.sup.9 H.sup.+ X or SO.sub.3.sup.- X wherein R.sup.8 and R.sup.