Purpose of test
This test is used to determine the amount of formaldehyde released by various textiles..
These can include:
- Yarns
- Fibers
- Other fabrics
Terminology Defined
Chromotropic acid — A chemical that reacts with formaldehyde and sulfuric acid and causes a test specimen to display color when formaldehyde is present.
Test method
Materials Used for Test
- Fabric test specimen
- Chemicals for testing
- Distilled water
Testing Procedure
- Chromotropic acid and sulfuric acid are the most commonly used chemical combination used for this test
Test Procedure (Summary)
Chemicals are combined with distilled water and applied to a test medium. The sample textile or solution will display a reddish-purple color if formaldehyde is present.