Spectrophotometers are highly standardized in measuring the spectral reflectance. These instruments can easily measure the reflectance of opaque liquids that are enclosed in optically transparent specimen cells that are placed over the reflectance port. This measuring device is highly recommended by the Testronix to measure the color of opaque liquids.
Properties
of Opaque Liquids
Opaque Liquids have numerous
non-uniform attributes that require
rewarding preparation and presentation techniques in order to ensure the
repeatability of sample measurements. The liquids are then measured through clear sample cells. These liquids sometimes contain bubbles or non-homogeneous areas that alter the color
measurement and requires the averaging of
readings using recommended color scale.
Color Space for Measuring Opaque Liquids
CIE L*a*b* is the best color descriptor that read and analyzes the color clearly under D 65
artificial daylight. Apart from this, L, a, b scale is also used
for Liquid Color Measurement. Both
the scales are intuitive. The use of these color scales can easily lead to understanding and communicate color values.
This application note discusses the benefits of each scale so that the user may
choose the best one as per the testing requirements.
How
to choose Best Color Scale?
To Choose best color
scale to measure the colors. L,
a, b and CIE L*a*b* (CIELAB) are the color scales
that can be used for liquid color measurement as they are based completely on the Color Theory. This theory
assumes that the receptor in the human eye perceives color keeping in mind certain pairs of opposite colors. Few of them
are:
·
L – Scale: Light vs. dark where a low number
between 0 and 51 indicates dark, and high
number between 51 and 100 indicates light
color.
·
Red vs. Green: The Positive number on a screen indicates Read and
a number with a negative number means green.
·
Yellow vs. Blue: Similarly as Red and Green color
pair methodology, the positive number
shows yellow and negative shows Blue.
All these values are considered to
describe the color of an object. For more information on Liquid ColorMeasurement, visit: www.testronixinstruments.com/
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