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… Continue reading AATCC 94-2017 Formaldehyde (Spot Test)