# ISO 1739:1975 — Withdrawn and superseded ISO standards

For ISO 1739:1975, item title is Butter — Determination of the refractive index of the fat (Reference method); status code is 9599; successor is ISO 1739:2006; withdrawn / published date is 1975-12-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 1739:1975 _(verified: appears in the quote below)_
- **Item title:** Butter — Determination of the refractive index of the fat (Reference method) _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 1739:2006
- **Withdrawn / published date:** 1975-12-01 _(verified: appears in the quote below)_

## What the source says

> 6359,IS,,ISO 1739:1975,Butter — Determination of the refractive index of the fat (Reference method),Beurre — Détermination de l'indice de réfraction de la matière grasse (Méthode de référence),1975-12-01,1,['67.100.20'],ISO/TC 34/SC 5,9599,,[44508],"['en','fr']",1,"<p>Describes a method of measurement which uses a refractometer with a scale graduated in refractive index units to the third decimal place and having prisms heated by means of a circulating liquid at 40 degrees centigrade, the temperature being thermostatically controlled to within +/- 0.1 degrees centigrade. A sodium vapour lamp shall be used as a light source.</p>"

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).