SIST EN 1557:1997

Surface active agents - Colorimetric characterization of optically clear coloured liquids (products) as X, Y, Z tristimulus values in transmission

This European Standard specifies a method for the colorimetric characterization of optically clear, slightly tinted liquids (products) by broad-band measurementof pure transmittance with tristimulus value measuring filters as Tx, Ty and Tz.Since the tristimulus value measuring filters of simple tristimulus colorimetersmeet the Luther condition to a limited extent only it is necessary to deliberately restrict the liquids (products) to slightly tinted ones...

Grenzflächenaktive Stoffe - Farbmetrische Charakterisierung von optisch klaren, gefärbten Flüssigkeiten (Produkten) als X-, Y-, Z- Transmissions-Farbwert

Diese Europäische Norm beschreibt ein Verfahren zur farbmetrischen Charakterisierung optisch klarer, schwach gefärbter Flüssigkeiten (Produkte) durch breitbandige Messung von Reintransmissionsgraden mit Normfarbfiltern als Tx, Ty und Tz. Da die Normfarbfilter einfacher Filter-Photometer die Luther- Bedingung nur bedingt einhalten, ist die bewußte Beschränkung auf schwach gefärbte Flüssigkeiten (Produkte) erforderlich...

Agents de surface - Caractérisation colorimétrique des liquides (produits) colorés optiquement clairs par composantes trichromatiques X, Y, Z en transmittance

La présente norme européenne spécifie une méthode de caractérisation colorimétrique des liquides (produits) optiquement clairs, légèrement teintés, par mesurage de la transmittance pure sur une large bande spectrale avec des filtres de mesure des composantes trichromatriques, Tx, Ty et Tz. Sachant que les filtres de mesure des composantes trichromatiques des spectrophotomètres à filtres simples ne remplissent la condition de Luther que dans une certaine limite, il est nécessaire de limiter les mesurages à ceux de liquides légèrement teintés...

Površinsko aktivne snovi - Kolorimetrično določanje transmisijskih standardiziranih barvnih vrednosti X, Y, Z bistrih obarvanih tekočin

General Information

• Status: Published
• Publication Date: 30-Nov-1997
• ICS: 71.100.40 - Surface active agents
• Technical Committee: KDS - Cosmetics, chemical disinfectants and surface active agents
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-1997
• Due Date: 01-Dec-1997
• Completion Date: 01-Dec-1997
• Ref Project: EN 1557:1996 - Surface active agents - Colorimetric characterization of optically clear coloured liquids (products) as X, Y, Z tristimulus values in transmission

Overview

EN 1557:1996 is a CEN European Standard for the colorimetric characterization of optically clear, slightly tinted liquids (notably surface active agent products) using transmission measurements. The standard defines a method to express color as X, Y, Z tristimulus values (Tx, Ty, Tz) by broad-band measurement of pure transmittance with tristimulus-value measuring filters. Because simple tristimulus colorimeters only approximate the Luther condition, the scope is intentionally limited to slightly tinted, optically clear liquids to ensure meaningful and reproducible colorimetric results.

Key topics and requirements

• Scope limitation: Applies to optically clear, slightly tinted liquids - not suitable for strongly colored or highly scattering samples.
• Measurement basis: Color expressed as tristimulus values (X, Y, Z) in transmission (Tx, Ty, Tz) using broad-band transmittance measurement.
• Instrumentation: Uses tristimulus colorimeters or equivalent filter-based devices; acknowledges practical limitations of simple instruments relative to ideal spectral matching (Luther condition).
• Transmittance measurement: Emphasis on pure transmittance measurement (transmission geometry) rather than reflectance.
• Reproducibility: Standard promotes consistent measurement practice so color data can be compared between laboratories, suppliers and customers.
• Limitations noted: Because filter matching is not perfect, only slightly tinted, optically clear products are appropriate to minimize measurement artifacts.

Applications

EN 1557 is practical for industries and labs that need standardized color communication and quality control of clear liquid products, for example:

• Manufacturers of surface active agents (surfactants) and liquid detergents
• Cosmetic and personal-care formulators (clear gels, clear liquid products)
• Chemical producers specifying color as an acceptance criterion
• Quality control and analytical laboratories performing routine color checks
• Instrument manufacturers and calibration services developing tristimulus colorimeters for transmission measurement

Using EN 1557 helps ensure consistent color specifications, batch-to-batch comparability, supplier-customer agreements, and objective acceptance criteria for optically clear liquid products.

Related standards

• CIE 1931 tristimulus system (CIE XYZ) - foundational colorimetry concept used by EN 1557
• Standards and guides on instrument calibration and measurement geometry (general color measurement best practices)
  Note: EN 1557 focuses specifically on transmission tristimulus measurements for clear, slightly tinted liquids and references the practical constraints of simple tristimulus filters (Luther condition).

Keywords: EN 1557, colorimetric characterization, tristimulus, X Y Z, transmission, optically clear coloured liquids, surface active agents, color measurement, tristimulus colorimeter, Luther condition.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.KþLQGrenzflächenaktive Stoffe - Farbmetrische Charakterisierung von optisch klaren, gefärbten Flüssigkeiten (Produkten) als X-, Y-, Z- Transmissions-FarbwertAgents de surface - Caractérisation colorimétrique des liquides (produits) colorés optiquement clairs par composantes trichromatiques X, Y, Z en transmittanceSurface active agents - Colorimetric characterization of optically clear coloured liquids (products) as X, Y, Z tristim
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