Detecting method and apparatus for permanent wave hairdressing
AssigneeKyoritsu Electrical Works, Ltd.
InventorAkitoshi Ando
Life of this patent
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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.
Claims3
An apparatus for detecting a condition of permanent waves in hair during a permanent wave hairdressing procedure which produces hydrogen sulfide gas, comprising:
- signal generating means;
- a lead acetate test paper connected to said signal generating means, said lead acetate paper changing color when exposed to said hydrogen sulfide gas;
- a sealable head cap having an attachment portion on an under surface, said lead acetate test paper being attached to said attachment portion formed on said under surface of said cap;
- and
- buzzer means connected to said signal generating means, said buzzer means generating warning sounds when activated by said signal generating means when said lead acetate test paper is changed into a dark color of a predetermined constant density.
Dependencies are inferred from the claim text.