How do you measure the color of bare metal materials?
Bare Metal Brass Disks
Bare metal with a brightened, polished surface showing both color and gloss characteristics in the specular reflectance with a rapid fall-off to near black at the aspecular angles.

Bare metals are classified as opaque metals and do not allow any light to pass through them. In opaque metals, the specular reflection and diffuse reflection are key to defining the light interaction of this unique sample type. For bare metals both color and gloss are seen in the specular reflection which makes up a large portion of the reflection. Continue reading

When do I use Specular Exclusion in Color Measurement?

FAQ: ASTM D6290 recommends that I measure my plastic pellets for yellowness using the specular exclude mode. What is this?

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