A solid which comprises the following constituents: a. a core which comprises glutamic acid-N,N-diacetic acid and/or a salt thereof, and b. a coating which comprises a compound of the general formula I in which R is C 1 - to C 30 -alkyl or C 2 - to C 30 -alkenyl, which additionally carries, as substituents, up to 5 hydroxyl groups, formyl groups, C 1 - to C 4 -alkoxy groups, phenoxy groups or C 1 - to C 4 -alkoxycarbonyl groups and can be interrupted by up to 5 nonadjacent oxygen atoms, is alkoxylate groups of the formula -(CH 2) k -O-(A 1 O) m -(A 2 O) n -Y in which A 1 and A 2, independently of one another, are 1,2-alkylene groups having 2 to 4 carbon atoms, Y is hydrogen, C 1 - to C 12 -alkyl, phenyl or C 1 - to C 4 -alkoxycarbonyl, and k is the number 1, 2 or 3, and m and n, in each case independently of one another, are numbers from 0 to 50, where the sum of m + n must be at least 4, is phenylalkyl groups having 1 to 20 carbon atoms in the alkyl, a five- or six-membered unsaturated or saturated heterocyclic ring having up to three heteroatoms from the group nitrogen, oxygen and sulfur, which can additionally be benzo-fused, where all of the phenyl rings and heterocyclic rings specified in the meanings for R can also additionally carry, as substituents, up to three C 1 - to C 4 -alkyl groups, hydroxyl groups, carboxyl groups, sulfo groups and/or C 1 - to C 4 -alkoxycarbonyl groups, or is a radical for the formula where A is a C 1 - to C 12 -alkylene bridge or a chemical bond, and each M, independently of the others, is hydrogen, alkali metal, alkaline earth metal, ammonium or substituted ammonium (e.g. organic amine salts) in the corresponding stoichiometric amounts. a. a core which comprises glutamic acid-N,N-diacetic acid and/or a salt thereof, and b. a coating which comprises a compound of the general formula I in which R is C 1 - to C 30 -alkyl or C 2 - to C 30 -alkenyl, which additionally carries, as substituents, up to 5 hydroxyl groups, formyl groups, C 1 - to C 4 -alkoxy groups, phenoxy groups or C 1 - to C 4 -alkoxycarbonyl groups and can be interrupted by up to 5 nonadjacent oxygen atoms, is alkoxylate groups of the formula -(CH 2) k -O-(A 1 O) m -(A 2 O) n -Y in which A 1 and A 2, independently of one another, are 1,2-alkylene groups having 2 to 4 carbon atoms, Y is hydrogen, C 1 - to C 12 -alkyl, phenyl or C 1 - to C 4 -alkoxycarbonyl, and k is the number 1, 2 or 3, and m and n, in each case independently of one another, are numbers from 0 to 50, where the sum of m + n must be at least 4, is phenylalkyl groups having 1 to 20 carbon atoms in the alkyl, a five- or six-membered unsaturated or saturated heterocyclic ring having up to three heteroatoms from the group nitrogen, oxygen and sulfur, which can additionally be benzo-fused, where all of the phenyl rings and heterocyclic rings specified in the meanings for R can also additionally carry, as substituents, up to three C 1 - to C 4 -alkyl groups, hydroxyl groups, carboxyl groups, sulfo groups and/or C 1 - to C 4 -alkoxycarbonyl groups, or is a radical for the formula where A is a C 1 - to C 12 -alkylene bridge or a chemical bond, and each M, independently of the others, is hydrogen, alkali metal, alkaline earth metal, ammonium or substituted ammonium (e.g. organic amine salts) in the corresponding stoichiometric amounts.