Environmental Factors and Color Measurement

When measuring color with a spectrophotometer, the measurement environment is just as important as the instrument itself. Small variations in temperature, light, or stability can directly lead to deviations in measurement results. Below is an overview of the most important environmental factors and points of attention.

Lighting Conditions

Spectrophotometers work with standardized light sources (such as D65). Ambient light can:

• add extra light (light leakage)
• cause unwanted reflections
• differ between measurement moments

Therefore ensure:

• a shielded measurement area
• minimal external light influences
• consistent choice of lighting source and observer

Temperature and Humidity

Materials respond to environmental conditions:

• temperature differences can cause expansion/contraction
• moisture affects surface structure and reflection
• spectrophotometers themselves can be sensitive to temperature drift

Recommended:

• measure in a climate-controlled room
• allow samples to acclimatize before measuring
• record temperature/humidity for critical measurements

Dust and Contamination

Contamination leads to:

• scattering of light
• deviating reflection
• inconsistent results between measurements

Check and clean:

• the sample surface
• the measurement aperture and optics of the instrument
• the work area around the setup

Vibrations and Stability

Vibrations affect internal optics and sample position. Avoid:

• vibrating workbenches
• machines in the immediate vicinity
• loose or unstable sample holders

Use a vibration-free surface where possible.

Air Quality

Floating particles or vapors can:

• affect the sample surface
• contaminate optical elements
• change light absorption

Keep the measurement area clean and well-ventilated, without direct contact with industrial vapors.

Sample Preparation and Placement

For reproducible measurements:

• always place samples in the same orientation
• ensure complete coverage of the measurement aperture
• use consistent pressure and positioning (e.g., a mold or holder)

Inconsistent sample handling is one of the most common causes of deviations.

Calibration and Maintenance

Regular calibration is necessary to correct drifts:

• follow the manufacturer's calibration frequency
• use correct and clean reference standards
• document date/time, conditions, and results

Maintenance of the instrument prevents deviations that only become visible later.

Temperature Equilibrium of the Sample

Materials that are temperature-sensitive may show different color characteristics when they:

• have just come out of production
• come from storage at higher or lower temperatures

Always allow samples to thermally stabilize before measuring.

Preventing Stray Light

Uncontrolled incident light causes measurement noise. Pay attention to:

• any gaps around the measurement aperture
• reflections from clothing or environment
• glossy work surfaces

Ideally work in a matte, neutrally colored measurement room.

Summary: How to Limit Environmental Influences

• Measure under controlled, standardized lighting conditions.
• Ensure stable temperature and humidity.
• Keep instrument and sample dust-free.
• Minimize vibrations and external interference.
• Calibrate regularly and document all conditions.
• Present the sample consistently and correctly.

By controlling these factors, color measurements become more reliable and reproducible, essential for color matching, quality control, and process management.

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Questions about color measurement or measurement conditions? Contact us at info@kleurinstituut.nl or call +31 (0)70 364 98 02.