ISO 10349-9-1992 PDF

Full title and description

ISO 10349-9:1992 — Photography — Photographic-grade chemicals — Test methods — Part 9: Reaction to ammoniacal silver nitrate. This part of ISO 10349 specifies a general qualitative test method for determining the reaction of photographic-grade chemical samples when treated with freshly prepared ammoniacal silver nitrate, using Nessler colour-comparison cylinders to compare colour and turbidity of test and blank solutions.

Abstract

The method is based on weighing a test portion, dissolving it in water, transferring the solution into each of two Nessler colour-comparison cylinders, preparing a test solution by adding freshly prepared ammoniacal silver nitrate to one cylinder and mixing, preparing a blank by adding ammonium hydroxide and water to the other cylinder and mixing, allowing the solutions to stand for about 2 minutes, and comparing the colour and turbidity of the two solutions. The comparison indicates whether the sample shows a reaction to ammoniacal silver nitrate.

General information

• Status: Published (International Standard; confirmed at periodic review).
• Publication date: 1992-12-30 (Edition 1, 1992).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 37.040.30 (Photographic chemicals).
• Edition / version: Edition 1 (1992).
• Number of pages: 2.

Scope

This part of ISO 10349 specifies a general test procedure to assess whether photographic‑grade chemicals react when exposed to ammoniacal silver nitrate. The procedure is intended for use in quality control and specification testing of photographic reagents and concentrates; it provides a rapid, primarily qualitative (or semi‑quantitative at best) comparison based on colour and turbidity differences between test and blank solutions rather than a calibrated quantitative determination. The method assumes use of standard glassware (Nessler cylinders) and freshly prepared reagents and is referenced to the general requirements of ISO 10349‑1.

Key topics and requirements

• Preparation and weighing of a defined test portion and dissolution in water.
• Use of two Nessler colour‑comparison cylinders: one for the test solution and one for the blank.
• Preparation of a freshly made ammoniacal silver nitrate reagent for the test cylinder and ammonium hydroxide/water for the blank.
• Allow solutions to stand (approximately 2 minutes) before visual comparison of colour and turbidity.
• Interpretation of results as presence/absence or relative degree of reaction (qualitative assessment).
• Conformance with the general provisions and definitions given in ISO 10349‑1 where applicable.

Typical use and users

Used by manufacturers of photographic chemicals, independent testing laboratories, photographic processing facilities, and quality assurance teams to screen raw materials and finished photographic reagents for reactive behaviour with ammoniacal silver nitrate. Conservation laboratories and archival facilities that evaluate chemical products used in photographic processing may also use this method as a quick check.

Related standards

ISO 10349 is a multipart series of test methods for photographic‑grade chemicals. Closely related parts include ISO 10349‑1 (General provisions), ISO 10349‑5 (Determination of heavy metals and iron content), ISO 10349‑7 (Determination of alkalinity or acidity) and ISO 10349‑11 (Determination of specific gravity). Some parts of the series have later revisions (for example ISO 10349‑1 was revised in 2002).

Keywords

photographic‑grade chemicals; ammoniacal silver nitrate; Nessler cylinders; qualitative test; colour comparison; turbidity; ISO 10349; photographic chemicals; quality control.

FAQ

Q: What is this standard?

A: ISO 10349‑9:1992 is Part 9 of the ISO 10349 series, giving a test method to assess the reaction of photographic‑grade chemicals to ammoniacal silver nitrate.

Q: What does it cover?

A: It covers a simple laboratory procedure—sample dissolution, addition of freshly prepared ammoniacal silver nitrate to a test cylinder and ammonium hydroxide to a blank, a short stand time (about 2 minutes), and visual comparison of colour and turbidity—to determine whether a sample reacts. The method is primarily qualitative.

Q: Who typically uses it?

A: Chemical manufacturers, photographic processing and QA laboratories, standards committees, and conservation/archival labs that need a fast screen for reactive behaviour of photographic reagents.

Q: Is it current or superseded?

A: ISO 10349‑9:1992 remains a published International Standard. The ISO catalogue shows this edition as published in December 1992 and confirmed at periodic review; no newer replacement specific to Part 9 is listed in the ISO entry. (Users should verify the ISO catalogue or national standards body for the latest status at time of need.)

Q: Is it part of a series?

A: Yes — it is one part of the multipart ISO 10349 series of test methods for photographic‑grade chemicals; other parts address general rules and specific determinations such as heavy metals, acidity/alkalinity and specific gravity.

Q: What are the key keywords?

A: Photographic‑grade chemicals; ammoniacal silver nitrate; Nessler colour‑comparison cylinders; colour comparison; turbidity; ISO 10349; qualitative test; quality control.