Do you have a source for liquid Saybolt and ASTM D1500 Color Standards?

These liquid visual color standards can be used as an independent test to verify instrumental Saybolt and ASTM D1500 Color measurement performance over time for these two visual color scales used to evaluate oil, oil additive and petrochemical color quality.

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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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How to Measure Small Samples

How can HunterLab instruments measure products of small quantities or small volumes?

Examples of small quantity sample holders.

Examples of small quantity sample holders.

               In these instances it is important to use the smallest amount of sample for color measurement. HunterLab has a wide variety of solutions to accurately and consistently measure the color of small samples including solids, powders, and liquids. The challenge is being able to measure the small samples in a way that provides an accurate and repeatable measurement for the customer. This is achieved through the use of special instrument accessories. Continue reading