Name: ISO 105-Z10:1997 — Textiles — Tests for colour fastness — Part Z10: Determination of relative colour strength of dyes in solution
SKU: ISO 105-Z10:1997
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ISO 105-Z10:1997 PDF

Textiles — Tests for colour fastness — Part Z10: Determination of relative colour strength of dyes in solution

Название (английский):

ISO 105-Z10:1997

Textiles — Tests for colour fastness — Part Z10: Determination of relative colour strength of dyes in solution

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 25 декабря 1997 г.
Издание:: ISO IS 105 edition 1 version 1
ICS:: 59.080.01

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Описание (английский):

La présente partie de l'ISO 105 est utilisée pour déterminer, par spectrophotométrie d'absorption sur des solutions colorantes, l'intensité de la couleur d'un colorant par rapport à celle d'un colorant de référence.NOTE 1: Parmi les conditions fondamentales de cette méthode, les solutions colorantes ne doivent pas disperser la lumière et doivent respecter la loi de Boug her-Lambert-Beer, et les solutions échantillons et de référence doivent avoir des courbes d'absorption identiques ou similaires dans le domaine du rayonnement visible du spectre.NOTE 2: Des courbes d'absorption similaires ou identiques s'obtiennent généralement si les essais sont réalisés dans un but de contrôle de production de lots ou livraisons d'un même colorant. La méthode n'est pas applicable à l'évaluation de colorants ayant des courbes d'absorption très différentes.NOTE 3: L'intensité de la couleur d'un colorant n'est pas une constante physique car elle dépend, entre autres, du milieu et de la méthode d'essai. L'intensité de couleur déterminée par la présente méthode peut donc différer de celle que donneraient d'autres déterminations, par exemple une évaluation instrumentale ou visuelle de teintures.

Overview

ISO 105‑Z10:1997 - Textiles - Tests for colour fastness - Part Z10 describes a spectrophotometric method to determine the relative colour strength of dyes in solution. The method compares a test dye with a reference dye by measuring absorbance (or transmittance) of prepared dye solutions and expressing the test dye’s strength as a percentage of the reference (reference = 100%). The standard emphasizes applicability where the dye solutions obey the Beer–Lambert law and have similar absorption curves in the visible region.

Key topics and technical requirements

Principle: Use spectrophotometric absorbance measurements; relative colour strength F = (ε2 / ε1) × 100. If solutions are at equal concentration, F can be simplified to (A2 / A1) × 100 (A = absorbance).
Scope conditions: Valid when solutions do not scatter light, follow Beer–Lambert law, and have identical or similar visible absorption spectra. Not suitable for dyes with distinctly different absorption curves.
Apparatus: Volumetric flasks (ISO 1042), one‑mark pipettes (ISO 648), cuvettes/cells (typically 5 mm or 10 mm path), analytical balance, spectrophotometer or filter colorimeter.
Solvents & additives: Water for water‑soluble dyes; methanol, ethanol, acetone, N‑methylpyrrolidone, cellosolves or mixtures for water‑insoluble dyes. pH adjusters, sequestering agents, surfactants, dispersing agents and antioxidants are recommended as needed for stability and reproducibility.
Sample preparation: Weigh ≥0.5 g to avoid micro‑inhomogeneity, dissolve/disperse quantitatively, equilibrate to 20–25 °C, dilute so maximum absorption corresponds to 10–60% transmittance.
Measurement rules: Measure promptly after preparation; keep absorbance differences between sample and reference within 30% to reduce instrument response bias; use identical cell path lengths.
Precision: Coefficient of variation under repeat conditions ≈ 0.2%–0.5% (individual 95% uncertainty ~0.4%–1.0%); expect at least double uncertainty across different labs.
Reporting: Include ISO reference, sample and reference dye designations, and relative colour strength. Full reports may list mass, solvent, dilution, instrument, wavelength, cell path length, etc.

Practical applications and users

Who uses it: Dye manufacturers, textile laboratories, quality control teams, R&D chemists and suppliers who need a reproducible, instrumental measure of dye potency.
When to use: Batch/delivery quality control, comparative strength checks during production, formulation verification, and situations where quick, reproducible solution measurements are preferred over full application dyeings.
Benefits: High reproducibility, low effort, faster than substrate dyeing; useful as a control method when correlation with application (dyeing) results has been established.

Related standards

ISO 1042 (laboratory glassware - volumetric flasks)
ISO 648 (laboratory glassware - one‑mark pipettes)
ISO 105 suite (other parts on colour fastness), see ISO 105‑A01 for list of parts
Informative references: Inter‑Society Color Council (ISCC) reports cited in the annex for methodological background

Keywords: ISO 105‑Z10, relative colour strength, colour strength, dye solution, spectrophotometric absorbance, Beer–Lambert law, textile dye testing, dye quality control.

ISO 105-Z10:1997 PDF

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Abstract

Overview

Key topics and technical requirements

Practical applications and users

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