A good dry soap can be made without the aid of expensive plant. To 40 gal. of water contained in a steam-jacketed pan add from 2 to 2 1/2 cwt. of soap cut up as fine as possible. A white curd soap with free lathering properties is best; on no account must a yellow soap be employed. This mixture is stirred until the soap has entirely dissolved and the mixture is pasty. Now add, in small quantities at a time, 4 cwt. of soda aso, stirring well all the time, then run the soap into shallow galvanised iron trays to cool. When cold, the mass will begin to break up into small pieces. It should be ground to powder in a mill - preferably an edge runner mill or disintegrator.