Analyzing Color: 45/0 versus Sphere SPIN Color Instrumentation 4

In the color industry, there are two classes of instrumentation based on their geometry that are used to measure color: “45/0” and “Sphere”.

45/0 Color Instrument

A 45/0 color instrument is used in situations where we want to measure color the way our eye sees color. Gloss levels influence the way our eye sees color. A high gloss sample appears darker to our eye than a matte gloss sample with the same pigment concentration. A practical use for a 45/0 color instrument is to check color consistency of consumer products when appearance is a deciding factor in a product purchase.

45°circumferential illumination 0° viewing perpendicular to sample plane This simulates visual color evaluation by excluding the gloss. The advantage of circumferential illumination is to achieve more repeatable measurements results on directional and structured surfaces. Photo courtesy of BYK-Gardner.

45°circumferential illumination
0° viewing perpendicular to sample plane
This simulates visual color evaluation by excluding the gloss. The advantage of circumferential illumination is to achieve more repeatable measurements results on directional and structured surfaces.
Photo courtesy of BYK-Gardner.

So for a 45/0 color instrument,

Differences in Gloss or Texture = Difference in Color

Specular Included Sphere Color Instrument

The sphere spin (specular included) geometry eliminates the influence of gloss and surface texture on the object’s color. A sphere spin color instrument is used in situations where color change is primarily influenced by the object’s colorants (i.e. pigments, dyes). A raw material supplier of pigments or resins would use the sphere spin geometry to check lot-to-lot consistency.

A sphere geometry illuminates´the sample diffusely by means of a white coated integrating sphere. Baffles prevent the light from directly illuminating the sample surface. Measurement is done using an 8° viewing angle. In the "SPIN" mode the total reflection light is measured: Diffuse reflection (color) + direct reflection (gloss).   Photo Courtesy of BYK-Gardner.

A sphere geometry illuminates´the sample diffusely by means of a white coated integrating sphere. Baffles prevent the light from directly illuminating the sample surface. Measurement is done using an 8° viewing angle. In the “SPIN” mode the total reflection light is measured:
Diffuse reflection (color) + direct reflection (gloss).
Photo Courtesy of BYK-Gardner.

So for a sphere spin color instrument,

Differences in Gloss or Texture ≠Difference in Color

Plastic Sample Plaque Sample

A plastic sample with the same pigmentation. One side is structured & matte and the other is smooth &  glossy. Photo courtesy of BYK-Gardner.

A plastic sample with the same pigmentation. One side is structured & matte and the other is smooth & glossy.
Photo courtesy of BYK-Gardner.

When measuring the example plaque with a 45/0 instrument, the instrument will measure a difference in the color between the glossy and structured sides.  The 45/0 measures color the way our eye sees color, and these two sides are clearly different.

When measuring the example plaque with a sphere spin instrument, the instrument will measure no difference in the color between the gloss and structured sides.  The sphere spin in not influenced by the gloss or texture of the surface of the sample.

4 comments

  1. Pingback: Exploring Color & Gloss and Weathering Basics « Measure What You See

  2. Pingback: BYK-Gardner to Offer Webinars « Measure What You See

  3. Pingback: Measuring the Light Reflectance Value (LRV) and its Importance in Safety Regulations « Measure What You See

  4. Pingback: What Does Spectrophotometer Geometry 45/0 versus Sphere Mean To You? « Measure What You See

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s