Chemically Brightened - A bright, specular finish usually applied to pre-polished material. It is particularly suitable for bright trim and reflectors. In a natural finish it can appear very similar to chrome, and in dyed gold, a similar finish to polished brass. This is achieved by immersion in a concentrated acid solution. In order to achieve a bright, reflective finish - the following points should be remembered.
- The choice of alloy is vital. For extrusions, 6063 and 6463 are recommended.
- Always use mill finish and not stripped metal.
- Film thickness greater than AA10 will seriously dull the finish.