From this
site:
The ALZAK® process is a surface treatment for the production of bright, reflective aluminum surfaces.
ALZAK® most benefits the following types of applications:
- Reflectors
- Automotive trim
- Appliance trim
- Household ware
- Gift ware
The outstanding functional and decorative characteristics obtained with the ALZAK process, have given it a prominent place as a useful and decorative finish.
As it relates to stage lighting, until the SourceFour came along in 1992 with its dichroic glass reflector, every quality lighting fixture had an aluminum reflector finished with the Alzak® process.
This 1936 catalog page touts the process:
Alzak
Linear Mode
