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Finish Comparison
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Advantages/ Limitations
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EPC (Embury Permanent Color)
Color is induced electrolytically at base of anodic and
is protected against leaching effects of atmosphere
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Anodic film thickness is not
related to color therefore thickness required for a particular application
can be specified for any color. Permanent light-fast finish. Receives
maximum protection against sunlight and weathering |
Sulphuric Acid
Anodizing and Dyeing
Color, induced electolytically is concentrated
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It is necessary to adjust dyeing
conditions to obtain similar colors with different film thick-
nesses. Because color is located in upper portion of film
thickness, color is highly susceptible to effects of abrasion
and elements. |
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Hard Color Anodizing
Color is induced electolytically uniformly throughout thickness
of anodic film
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Colors produced by this process are
light-fast but depth of color varies with anodic film thickness.
Film abrasion will alter color depth. In addition, alloy is
major variable with some colors being restricted to specific
alloys. |
