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When used with industrial and commercial products, there is more than one definition of “opacity” as an optical property.

Contrast Ratio Opacity (OP) measurements quantify how close to opaque a near-opaque material is.

The measurement is a two-part program metric where the CIE Y (luminance or brightness) value is first measured the sample backed by a black background, followed by a second measurement of the Y value of the sample backed by a white background. The resulting fraction is expressed as Y%, calculated as follows:.

As Y Brightness is a colorimetric value calculated based on a CIE illuminant/’observer

condition, this must be specified and reported. The illuminant/observer choice will vary depending on the industry – A/2 (automotive), C/2 (historical and default choice), D65/2 (printing) and D65/10 (often used in current color measurements). As Opacity is a ratio, the results will be nearly identical for any of these illuminant/observer conditions.

Typical applications where contrast opacity is an important appearance characteristic are coating drawdowns and single sheets or layers of paper, plastic and textiles.
The primary appearance concern is lot-to-lot consistency in a material that is inherently not quite opaque.

Contrast Ratio Opacity measurement quantifies how opaque a sheet sample using two readings. One reading is taken with the black glass or light trap backing the sample at the port. The second reading is taken with the sample backed by a white tile or the white sample clamp insert. EasyMatch QC will prompt you for the proper backing when taking opacity measurements.

Opacity Measurement in EasyMatch QC

To perform opacity measurements in EasyMatch QC, first standardize the instrument in a reflectance mode. Once standardized in reflectance, select “Opacity” to display in the Color Data View by going to Options/Read Method’.

A new window will open that allows you to choose Contrast Ratio Opacity as a read mode. Additional display options include the option to display:

• Y Brightness value of the sample backed with the white backing which can be used to indicate the overall reflectance or luminous brightness as additional optical information.
• Y Brightness value of the sample backed by black backing which is the second component of the Contrast Ratio Opacity calculation.

A typical display is just Opacity with some users selecting the Opacity, Yw combination.

Another option is the choice of an illuminant and observer for opacity reporting. Chose C/2 if you have no prior conditions. Once all of your selections are made click ‘OK’ to save and these metrics will be displayed in your Color Data View.

Put your mouse over the Color Data View/Right Click/Configure to select additional metrics such as CIE L*, a*, b* D65/10 color values as a complete quantifier of the color, or Yellowness Index E313 C/2 or D65/10 as a single quantifier for yellowness of white materials. Different metrics provide different optical information. Color values quantify the color of the sheet; contrast ratio opacity quantifies how opaque the sheet material is.

Both “hydro” coming from Greek origins for water and “hygro” coming from the Greek “hygrós” for wet or moist, tend to be used in two terms for the same optical phenomena.

ASTM E284 on standard appearance terminology prefers the name “hygrochromic”.

Powder coating is a dry finishing process that can improve efficiency, maximize production, and enhance environmental compliance. This coating is available in virtually limitless color options, so it can be hard to know what color to use. Read more about how to pick a powder coat color.

What Is Powder Coating?

Powder coating is a dry powder made from curatives, flow modifiers, and leveling agents. This mixture is applied to the surface using electrostatic spray deposition (ESD) and a spray gun. The electrostatic charge helps attract the powder particles to the surface, creating a bond. Once the powder coating is applied, it is cured with heat.

This durable finish protects the surface from rust, corrosion, and exposure to the elements. It can also be used as a decorative finish to give the equipment a certain color.

Tips to Get Color Right in the Powder Coating Industry

Getting the right look for your equipment can be challenging since there are so many options available. If you’re looking at a powder coating color chart and still cannot decide which color to go with, follow these tips for picking a powder coat color:

• Get in different lighting: Light influences how we perceive color. View your powder coating sample in the sunlight, a shadowed space, and fluorescent light, and put the light source at different angles. These different viewing conditions will give you a good picture of what the powder coating will look like.
• Decide on a color style: If you are powder coating just one part of your equipment, you can choose an accent color to make it pop, a contrasting color to stand out, or a complementary color to fit the look.
• Hide the part’s imperfections: Dark and metallic powder coating colors best hide imperfections on the part’s surface.
• Choose a semi-gloss or satin finish: A semi-gloss or satin powder coating finish gives you the right amount of reflection to make the part look nice. A glossy finish can be too shiny in some conditions.
• Go for an industrial look: Matte and flat finishes are the best choices if you want a tough or commercial look for the piece.

ギリシャ語で水を意味する "hydro "と、ギリシャ語で湿った、湿ったを意味する "hygrós "を語源とする "hygro "は、同じ光学現象に対して2つの用語が使われる傾向がある。

標準的な外観用語に関するASTM E284では、「ハイグロクロミック」という名称が好まれている。

Sowohl "hydro", das aus dem Griechischen stammt und Wasser bedeutet, als auch "hygro", das aus dem Griechischen "hygrós" für nass oder feucht stammt, werden in der Regel als zwei Begriffe für dieselben optischen Phänomene verwendet.

Die ASTM E284 zur Standardterminologie für das Erscheinungsbild bevorzugt die Bezeichnung "hygrochrom".

Tanto "hydro", de origen griego, que significa agua, como "hygro", del griego "hygrós", que significa húmedo o mojado, suelen utilizarse en dos términos para designar el mismo fenómeno óptico.

La norma ASTM E284 sobre terminología de apariencia estándar prefiere el nombre "higrocrómico".