A process for isolating a compound of Formula 1 from a product mixture comprising a polyphenolic triazine compound or a polyresorcinol triazine compound and a compound of Formula 1 wherein in Formula 1, Ar 1 and Ar 2 are the same or different and are radicals of the compound of Formula 2 and wherein R 1 is hydrogen and R 2, R 3, R 4 and R 5, are the same or different and are hydrogen, alkyl of 1 to 24 carbon atoms, haloalkyl of 1 to 24 carbon atoms, aryl of 6 to 24 carbon atoms, alkenyl of 2 to 24 carbon atoms, acyl of 1 to 24 carbon atoms, cycloalkyl of up to 24 carbon atoms, cycloacyl of 5 to 24 carbon atoms, aralkyl of 7 to 24 carbon atoms, or aracyl of 6 to 24 carbons atoms, substituted or unsubstituted biphenylene, substituted or unsubstituted naphthalene, OR, NRR', CONRR', OCOR, CN, SR, SO 2 R, and optionally with either of R 3 and R 4 or R 4 and R 5 taken together being a part of a saturated or unsaturated fused carbocyclic ring and wherein each R, R', R 6, R 7, R 8, R 9, and R 10 are the same or different and each is hydrogen, alkyl of 1 to 24 carbon atoms, haloalkyl of 1 to 24 carbon atoms, aryl of 6 to 24 carbon atoms, alkenyl of 2 to 24 carbon atoms, acyl of 1 to 24 carbon atoms, cycloalkyl of up to 24 carbon atoms, cycloacyl of 5 to 24 carbon atoms, aralkyl of 7 to 24 carbon atoms, or aracyl of 6 to 24 carbons atoms, substituted or unsubstituted biphenylene, substituted or unsubstituted naphthalene, and optionally with either of R 6 and R 7, R 7 and R 8, R 8 and R 9, or R 9 and R 10, taken together being a part of a saturated or unsaturated fused carbocyclic ring optionally containing O, N, or S atoms in the ring, and R 6, R 7, R 8, R 9, and R 10, may be an alkoxy of 1 to 24 carbons, and Y is a direct bond, O, NR", or SR", wherein R" is hydrogen, alkyl of 1 to 24 carbon atoms, haloalkyl of 1 to 24 carbon atoms, aryl of 6 to 24 carbon atoms, alkenyl of 2 to 24 carbon atoms, acyl of 1 to 24 carbon atoms, cycloalkyl of up to 24 carbon atoms, cycloacyl of 5 to 24 carbon atoms, aralkyl of 7 to 24 carbon atoms, or aracyl of 6 to 24 carbons atoms; wherein said process comprises the steps of: (a) contacting a product mixture comprising the compound of formula 1 with an inorganic base to form an isolation blend, wherein said product mixture comprises said compound of Formula 1 and a polyphenolic-triazine compound, and isolating the compound of Formula 1 from the isolation blend, which isolation is effected - if the product mixture in solid form is contacted with an inorganic base which is dissolved in water, in a solvent or a mixture of solvents, by filtration, or - if the product mixture is dissolved in a solvent which is organic-based, and the inorganic base is dissolved in a solvent which is aqueous-based, by removing the inorganic base layer from the two layers formed wherein the solvent used to dissolve the inorganic base is immiscible with the solvent used to dissolve the product mixture, and (b) contacting a product mixture comprising the compound of formula 1 with a hydrocarbon solvent to form an isolation blend, wherein said product mixture is in solid form and comprises said compound of Formula 1, and mixing or stirring the isolation blend for a time of between ten minutes and ten hours, and thereafter isolating the compound of Formula 1 from the isolation blend by filtering the isolation blend, wherein steps (a) and (b) are conducted in a step-wise fashion, in any order. (a) contacting a product mixture comprising the compound of formula 1 with an inorganic base to form an isolation blend, wherein said product mixture comprises said compound of Formula 1 and a polyphenolic-triazine compound, and isolating the compound of Formula 1 from the isolation blend, which isolation is effected - if the product mixture in solid form is contacted with an inorganic base which is dissolved in water, in a solvent or a mixture of solvents, by filtration, or - if the product mixture is dissolved in a solvent which is organic-based, and the inorganic base is dissolved in a solvent which is aqueous-based, by removing the inorganic base layer from the two layers formed wherein the solvent used to dissolve the inorganic base is immiscible with the solvent used to dissolve the product mixture, and - if the product mixture in solid form is contacted with an inorganic base which is dissolved in water, in a solvent or a mixture of solvents, by filtration, or - if the product mixture is dissolved in a solvent which is organic-based, and the inorganic base is dissolved in a solvent which is aqueous-based, by removing the inorganic base layer from the two layers formed wherein the solvent used to dissolve the inorganic base is immiscible with the solvent used to dissolve the product mixture, and (b) contacting a product mixture comprising the compound of formula 1 with a hydrocarbon solvent to form an isolation blend,