Abstract: Compositions comprising at least one epoxy resin and/or reactive diluents, at least one hardener for the at least one epoxy resin, at least one curing indicator, wherein the color of the composition changes depending on the curing degree, a process for determining sufficient cure of a composition comprising providing a composition comprising at least one epoxy resin and a hardener for the epoxy resin, adding a curing indicator, applying curing conditions to the colored composition until the composition changes its color and use of polymeric colorants as curing degree indicator, wherein the curing indicator is a polymeric colorant consisting of chromophores which are chemically bound to polymers having reactive groups.

Abstract: Compositions comprising at least one epoxy resin and/or reactive diluents, at least one hardener for the at least one epoxy resin, at least one curing indicator, wherein the colour of the composition changes depending on the curing degree, a process for determining sufficient cure of a composition comprising providing a composition comprising at least one epoxy resin and a hardener for the epoxy resin, adding a curing indicator, applying curing conditions to the coloured composition until the composition changes its colour and use of polymeric colourants as curing degree indicator, wherein the curing indicator is a polymeric colourant consisting of chromophores which are chemically bound to polymers having reactive groups.