This invention relates to a hair styling brush and method of use. A brush according to the invention will have particular utility with hair which is to be "blow dried", usually after the hair has already been partially dried, for instance after it has been "towel-dried". There is provided a hair styling brush which includes a head, a handle connected to the head, and bristles carried by and projecting from the head wherein the head carries a temperature sensitive color-change material, the material being selected to be inert to hair and adapted to indicate a minimum threshold temperature for hair styling. There is also provided a method of use of such a hair styling brush.

A series of chemically synthesized compounds known as metal mercury iodides or metal tetraiodomercurates having use as infrared detectors are made by reacting potassium tetraiodomercurate(II) with monovalent metal nitrates or iodides, such as thallium(I), indium(I) or copper(I) nitrates. In the case of gold, the gold(I) iodide is used because the nitrate is not known. The precipitated metal (thallium, indium, copper, gold, etc.) tetraiodomercurate is then filtered, dried, and purified (recrystallized) and pressed into a disk under high pressure. Alternatively, the material can be grown as a large crystal by zone melt fusion methods.

By employing the teaching of the present invention, all of the difficulties and drawbacks found in conventional prior art hair curlers/rollers are eliminated. By providing a fully integrated, elongated body member which comprises an elongated central section having a generally rod-like construction, an enlarged loop or eyelet formed at one end of the central section, and elongated continuous, multi-segmented finger member formed at the opposed end of the central section, an easily used, one-piece, clipless hair curler/roller is provided. In addition, all portions of the hair roller/curler are inherently flexible, enabling the central section to be used for receiving the user's hair is wound thereon in the desired manner, and once completely wound thereon, the hair fibers are quickly and easily held in place by flexibly moving the multi-segmented finger member into the loop or eyelet until the hair fibers are locked in place about the central section thereof. Furthermore, the hair curler/roller of the present invention also incorporates color changing, temperature sensitive material formed over a major portion thereof which is constructed for providing a clear, distinctive, and visually recognizable color change. As a result, the use of the hair curler/roller at the appropriate time, or temperature, is easily determined by the user.

A hairbrush, the surface of which changes colour with temperature, is used to improve the set of human hair during a grooming process. The bristles of the brush may be of a colour temperature dependent nature as well as the surface on which the bristles are mounted or protrude.

An epilatory wax container or a device, for example an applicator, for use in conjunction therewith includes a thermochromic material. The color change of the thermochromic material provides an indication that the wax in the container is at an appropriate temperature for application to the body.