ISO 105-Z10-1997 PDF

Full title and description

ISO 105‑Z10:1997 — Textiles — Tests for colour fastness — Part Z10: Determination of relative colour strength of dyes in solution. This part of ISO 105 specifies a laboratory spectrophotometric procedure to determine the colour strength of a dye relative to a reference dye by measuring absorbance of dye solutions and calculating a percentage colour‑strength value.

Abstract

Part Z10 of ISO 105 gives a quantitative spectrophotometric method for comparing the colour strength (relative extinction/absorptivity) of a dye against a reference dye in solution. The method assumes solutions that do not scatter light, obey the Beer–Lambert law, and have similar visible absorption spectra; results are expressed as a relative colour‑strength percentage calculated from specific extinction coefficients or measured absorbances. Practical guidance on apparatus, solvents, solution preparation and calculation procedures is included.

General information

• Status: Published (International Standard; confirmed on review cycles).
• Publication date: 1997‑12 (first edition 1997).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.080.01 (Textiles in general; colour fastness tests).
• Edition / version: Edition 1 (1997).
• Number of pages: 9 pages (ISO edition information).

Scope

This method is intended for determination of the colour strength of a dye in relation to a designated reference dye by means of spectrophotometric absorption measurements on dye solutions. It is intended primarily for production control and batch/delivery checks where test solutions meet preconditions (no scattering, adherence to Beer–Lambert law, and similar absorption curves in the visible region). The standard is not applicable for dyes with distinctly different absorption curves. Normative references cited include laboratory glassware standards used for volumetric flasks and pipettes.

Key topics and requirements

• Measurement principle: spectrophotometric absorbance and Beer–Lambert relationship; calculation of relative colour strength from specific extinction coefficients or direct absorbance ratios (Fs = (ε2/ε1) × 100; equivalently using A values when path length and concentration are controlled).
• Preconditions: solutions must be non‑scattering, within linear range of Beer–Lambert law, and have similar visible absorption spectra to the reference.
• Apparatus and materials: spectrophotometer or filter colorimeter, cuvettes/cells (typical path lengths 5 mm or 10 mm), volumetric flasks, pipettes, analytical balance and appropriate solvents for the dye class.
• Sample preparation: dissolve or disperse quantitatively, control temperature and pH as required, dilute to specified absorbance/transmittance range for reliable measurement.
• Calculation and reporting: procedures for calculating relative colour strength, reporting units/conditions, and notes on limitations (colour strength depends on medium and method and may differ from other assessments).
• Normative references: e.g., ISO 1042 (volumetric flasks) and ISO 648 (one‑mark pipettes) are referenced for laboratory glassware.

Typical use and users

Used by dye manufacturers, textile chemical laboratories, quality control and R&D teams in the textile and dye industries for batch control, incoming/outgoing inspection of dye lots, inter‑batch comparisons and production consistency checks. Also used by standards bodies and testing laboratories that perform instrument‑based colour measurements.

Related standards

ISO 105 is a multipart series covering many colour fastness tests for textiles (parts include method families such as G03 — colour fastness to ozone, and other Z‑parts for dye solution behaviour, e.g. Z07–Z11). Part Z10 is one element of this broader ISO 105 collection of test methods and has been adopted in regional/ national implementations (EN ISO / DIN EN ISO versions in 1999).

Keywords

colour strength; relative colour strength; dye solution; spectrophotometry; Beer–Lambert law; textile dyes; ISO 105; dye quality control; absorbance; extinction coefficient.

FAQ

Q: What is this standard?

A: ISO 105‑Z10:1997 is a part of the ISO 105 series that specifies a laboratory spectrophotometric method for determining the relative colour strength of dyes in solution — i.e., comparing a test dye to a reference dye using absorbance measurements.

Q: What does it cover?

A: It covers the principle, required apparatus, sample preparation, calculation method and reporting for relative colour‑strength determination, and lists normative references for laboratory glassware. It applies where dye solutions are suitable for spectrophotometric measurement (no scattering, linear Beer–Lambert behaviour, similar absorption curves).

Q: Who typically uses it?

A: Dye manufacturers, textile and chemical testing laboratories, quality control engineers, formulation and R&D teams in textile/dye production, and conformity assessment bodies that perform standardized instrumental comparisons of dyes.

Q: Is it current or superseded?

A: The ISO record for ISO 105‑Z10:1997 indicates the 1997 edition is published and has been subject to periodic review; the ISO entry shows the part was reviewed and the edition remained confirmed in recent reviews (confirmation activity recorded through 2024), so the 1997 text remains the current published edition. Users should check ISO or their national standards body for any later amendments or withdrawals before relying on the text for compliance.

Q: Is it part of a series?

A: Yes — ISO 105 is a multipart series of colour‑fastness test methods for textiles; Z10 is one Z‑part within that series (other Z parts and G parts cover related dye/colour tests such as Z07–Z11, G03, etc.).

Q: What are the key keywords?

A: colour strength, relative colour strength, dye solution, spectrophotometry, extinction coefficient, absorbance, Beer–Lambert law, textile dyes, ISO 105.