Ammonium thioglycolate solution in heat-assisted permanent waving

A heat-assisted ammonium thioglycolate permanent waving system is provided in which heat-containing clamps applied to the hair to assist the action of the ammonium thioglycolate bring the hair up to hair waving temperature and maintain it at such temperature for no more than six minutes and in which the ammonium thioylycolate solution is weaker than is used in non-heat-assisted permanent waving for the same type of hair and stronger than has been used in prior heat-assisted permanent waving for the same type of hair.

In a heat-assisted method for the permanent waving of hair in which an aqueous solution containing ammonium thioglycolate is applied to hair wound around a roll to wet said hair, the wetted hair is maintained at an elevated temperature by a heated clamp holding said hair around said roll, excess ammonium thioglycolate solution is then removed and an oxidizing solution is thereafter applied to said hair to neutralize said ammonium thioglycolate solution, the improvement which comprises permitting said heated clamp to heat said wetted hair to a temperature above 120°F. and to maintain a temperature above 120°F. for no more than 6 minutes, and utilizing as said ammonium thioglycolate solution, a solution of greater strength than is used on similar hair in prior heat-assisted permanent waving and of lesser strength than is used in prior non-heat-assisted permanent waving, wherein said ammonium thioglycolate solution is an aqueous solution selected from a group consisting of solutions having a thioglycolate content between 9.6 and 9.8 weight percent and a pH level between 7.5 and 7.7; solutions having a thioglycolate content between 2.4 and 2.6 weight percent and a pH level between 9.30 and 9.40; solutions having a thioglycolate content between 8.4 and 8.6 weight percent and a pH level between 8.3 and 8.5; or solutions hav-ing a thioglycolate content between 0.70 and 0.80 weight percent and a pH of 7.5 to 7.7.

A permanent waving composition for heat-assisted permanent waving whereby hair wetted by said composition is maintained at an elevated temperatureby a heated clamp holding hair around a roll, said composition comprising an aqueous solution selected from a group consisting of solutions having a thioglycolate content between 9.6 and 9.8 weight percent and a pH
level between 7.5 and 7.7; solutions having a thioglycolate content between 8.4 and 8.6 weight percent and a pH level between 8.3 and 8.5; or solutions having a thioglycolate content between 0.70 and 0.80 weight percent and a pH of 7.5 to 7.7; said ammonium thioglycolate solution being of greater strength than is used in prior heat-assisted permanent waving and of lesser strength than is used in prior non-heat-assisted permanent waving.