ASTM D1209-25 PDF

Full title and description

Standard Test Method for Color of Clear Liquids (Platinum‑Cobalt Scale) — ASTM D1209‑25. This test method describes a visual procedure for assessing the color (degree of yellow/platinum‑cobalt color) of essentially light‑colored, clear liquids by comparison with platinum‑cobalt reference standards; it is used to evaluate solvent and product appearance, degree of refinement, and contamination or storage effects.

Abstract

ASTM D1209‑25 specifies the procedure for visually determining the color of clear, light‑colored liquids using the platinum‑cobalt (APHA/Hazen) color scale and matching against prepared standards. The method includes guidance on applicability (limited to liquids whose colorants have absorption similar to the platinum‑cobalt standards), rounding rules for reporting, and basic safety notes. The standard is short (formal test method, 4 pages) and intended for routine quality control and specification work.

General information

• Status: Active standard.
• Publication date: 01 January 2025 (designated D1209‑25).
• Publisher: ASTM International.
• ICS / categories: 87.040 — Paints and varnishes / appearance and color.
• Edition / version: D1209‑25 (revision of earlier D1209 editions).
• Number of pages: 4 pages.

Scope

This test method covers a visual comparison procedure for measuring the color of essentially light‑colored, clear liquids using the platinum‑cobalt (APHA/Hazen) scale. It is applicable only where the color‑producing substances in the sample have light absorption characteristics similar to the platinum‑cobalt standards. The standard also specifies rounding rules for reporting results and notes on units and safety. It is not intended for substantially dark or strongly colored liquids (other methods or guides such as Guide D365 are referenced for darker liquids).

Key topics and requirements

• Use of the platinum‑cobalt color scale (often referred to as APHA or Hazen style color numbers) for quantifying color in clear liquids.
• Visual comparison of sample against prepared platinum‑cobalt standard solutions in matched cells or viewing apparatus.
• Applicability limitation: only for liquids whose colorants absorb light similarly to platinum‑cobalt standards; not suitable for all types of colorants.
• Reporting and rounding rules (results rounded per Practice E29 to the nearest reported unit).
• Notes on equivalence and comparability to other color scales (e.g., Saybolt for some hydrocarbons) and caution about exact equivalencies.
• Brief safety and handling notes directing users to Material Safety Data Sheets and good laboratory practice.

Typical use and users

Used by quality control and analytical laboratories in paints, coatings, solvents, chemical manufacturers, petrochemical and lubricant testing labs, and R&D groups for routine appearance checks, specification compliance, and incoming raw material inspection. Useful for suppliers and purchasers who specify color limits for clear liquids and solvents.

Related standards

Related and often‑referenced documents include: Guide D365 (procedures for estimating color of darker liquids), ASTM D156 (Saybolt colorimeter methods used in petroleum industry), Standard Methods for the Examination of Water and Wastewater (APHA/Hazen color preparations), and other ASTM color or clarity tests. The D1209‑25 revision was developed by subcommittee D01.35 as a revision of earlier D1209 editions.

Keywords

platinum‑cobalt; APHA color; Hazen; color of clear liquids; colorimetry; visual color comparison; D1209; paints and varnishes; solvent color.

FAQ

Q: What is this standard?

A: ASTM D1209‑25 is the Standard Test Method for Color of Clear Liquids (Platinum‑Cobalt Scale), a short ASTM procedure for visually determining the color of light‑colored, clear liquids by comparison to platinum‑cobalt reference standards.

Q: What does it cover?

A: It covers the visual comparison procedure, applicability limits (only for liquids with colorants whose absorption matches the platinum‑cobalt standards), reporting/rounding rules, and basic safety guidance. It is not intended for strongly colored or opaque samples; Guide D365 addresses darker liquids.

Q: Who typically uses it?

A: QC and analytical laboratories in paints, coatings, solvents, petrochemical and lubricant industries, manufacturers and suppliers who specify or verify color requirements for clear liquids.

Q: Is it current or superseded?

A: It is current and active as ASTM D1209‑25, published in 2025; it replaces earlier editions (the revision work item references D1209‑05(2019) and earlier versions). Users should specify the D1209‑25 designation when requiring the latest requirements.

Q: Is it part of a series?

A: D1209 is maintained by ASTM Committee D01 (Paints, Coatings and Solvents), Subcommittee D01.35, and appears in the ASTM Book of Standards Volume covering related paint and solvent methods (Book Vol. 06.04). It is often cited alongside other color and appearance standards in the D01 family.

Q: What are the key keywords?

A: platinum‑cobalt, APHA, Hazen, color, clear liquids, colorimetry, visual comparison, D1209.