Detecting method and apparatus for permanent wave hairdressing

Details Detecting method and apparatus for permanent wave hairdressing Detecting method and apparatus for permanent wave hairdressing

1980-04-28

1983-08-09

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

340514, 340573, 340632, 116207, 132 7, 422 56, 436183, G08B 2300, G01N 3122

Patent

active

043981836

ABSTRACT:
A method for detecting a condition of permanent waves during a permanent wave hairdressing, by using a chemical liquid which makes permanent waves and which produces a hydrogen sulfide gas at a predetermined temperature, and by exposing a lead acetate test paper to the hydrogen sulfide gas which changes colors to indicate the condition of the permanent wave. An apparatus having a light emitting diode detects the change in color of the test paper and activates a buzzer when a predetermined change of color is detected.

REFERENCES:
patent: 2235895 (1941-03-01), Maize
patent: 3139328 (1964-06-01), Jacob
patent: 3980437 (1976-09-01), Kishimoto et al.
patent: 4139610 (1979-02-01), Miyazaki et al.
patent: 4158704 (1979-06-01), Baer et al.
patent: 4174202 (1979-11-01), Simpson
patent: 4228810 (1980-10-01), Moore et al.

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