The manufacture of syndet bars requires special machinery and somewhat different processing steps than those used for normal toilet soap production. Fully synthetic bars are higher priced specialty products which offer special properties not available in normal soaps. Syndet bars: are free from alkali; they can be neutral or adjusted to pH levels below 7; are used for skin problems; lather and clean very well at various water hardnesses without forming a curd or precipitate; are compatible with a large variety of additives; and use less perfume than normal soaps.
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Hollstein et al. (1982) studied this question.
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