Overview
ISO 105-A06:1995 is an international standard established by the International Organization for Standardization (ISO) for the instrumental determination of 1/1 standard depth of colour in textiles. This standard provides a reliable and objective colorimetric method as an alternative to the traditional visual assessments described in ISO 105-A01:1994. It is specifically designed to measure the depth of colour of dyeings on any textile material using precise instrument-based techniques.
The standard plays a critical role within the textile industry for testing and ensuring colour fastness and uniformity of dyed fabrics, supporting quality control and consistency in textile production.
Key Topics
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Scope and Purpose
The standard focuses on the 1/1 standard depth of colour and serves as an alternative method to visual evaluation, applicable to any textile material. It enhances accuracy by using instrumental colorimetry rather than subjective visual comparison.
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Measurement Principles
ISO 105-A06 measures the CIELAB colour coordinates:
- L* (lightness)
- C* (chroma)
- h* (hue)
The lightness difference between the measured fabric and the calculated 1/1 standard depth is determined to assess whether the specimen meets the standard.
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Apparatus Required
A spectrophotometer or colorimeter compliant with CIE Publication 15.2 is used to obtain precise colour data under standard observation conditions (10° observer, illuminant D65).
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Specimen Preparation
Test samples should be representative areas of the dyeing, cut to at least 50 mm x 50 mm, mounted on an opaque white backing without fluorescent whitening agents, and checked for opacity.
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Test Procedure
Multiple colorimetric readings are taken at different areas of the specimen to average out variations. The lightness difference (ΔL) calculated via the standard equation determines conformity to the 1/1 standard depth.
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Reporting Requirements
Test reports must include:
- Reference to ISO 105-A06:1995
- Detailed sample identification
- Instrument type and configuration
- Measured colour values
- Test date
Applications
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Textile Quality Control
Ensures consistency in colour depth across production batches, critical for manufacturers aiming to meet customer and regulatory requirements regarding colour fastness.
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Dye Development and Verification
Supports dye manufacturers and textile processors in verifying dye concentration and shade reproducibility by providing an objective measure of colour depth.
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Standardization of Colour Measurement
Facilitates harmonized methods for colour testing internationally, reducing variability introduced by subjective visual assessments.
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Compliance and Certification
Assists in meeting industry standards and regulations related to textile colour performance, useful for certification bodies and laboratories conducting textile testing.
Related Standards
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ISO 105-A01:1994
Specifies the visual method for determination of standard depth of colour, which ISO 105-A06 complements with an instrumental alternative.
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CIELAB Colour Measurement Standards (CIE Publication 15.2:1986)
Provides foundational guidelines for colorimetric measurements used in ISO 105-A06 test procedures.
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ISO 105 Series
A comprehensive suite of standards for testing various aspects of colour fastness in textiles, including resistance to washing, light, rubbing, and more.
Keywords: ISO 105-A06, colour fastness, textile colour testing, standard depth of colour, instrumental colorimetry, CIELAB coordinates, spectrophotometer textile testing, dyeing depth measurement, textile quality control, colour measurement standards