Abstract: In a process for producing an edible roe-like multilayer spherical structure composed of at least two layers including an inner layer and an outer layer occluding the inner layer, which comprises a step of synchronously discharging at least two edible materials through a multi-tubular nozzle having at least two different passages including an inner passage and an outer passage surrounding the inner passage and a step of chemically gelling the resulting multilayer spherical structure with a metal ion acceptable for human intake, the outer layer in said resulting multilayer spherical structure being chemically gellable with said metal ion; the improvement wherein(i) said at least two edible materials are at least two edible aqueous sol materials having different properties of being chemically gelled with said metal ion, and(ii) among said edible aqueous sol materials, a material forming the inner layer is convertible to a softer aqueous gel than a material forming the outer layer or is present as an aqueous sol

Abstract: A method for clarifying an aqueous waste liquid containing acid dyes dissolved therein by bringing said waste liquid into contact with a dicyandiamide-formaldehyde resin, wherein said dicyandiamide-formaldehyde in an optimum amount as defined in the specification and at least about 300 ppm of aluminum sulfate are added sequentially to said aqueous waste liquid, the amount of the additives being based on 100 ppm of the dyes.

Abstract: A process for treating a pulp-containing waste liquor which comprises adding a flocculating agent to the pulp-containing waste liquor and separating and removing the resulting flocculated matter, characterized in that about 1 to about 50 parts by weight, per 1000 parts by weight of the turbid components in said waste liquor, of a dicyandiamideformaldehyde resin is admixed with the waste liquor, and then aluminum sulfate is added to the mixture.