Original sentence: A uniform set of international standards in saffron grading was established by the International Organization for Standardization, which is an international federation of national standards bodies.Absorbance is defined as , with  as absorbance (Beer-Lambert law).It establishes four empirical grades of colour intensity: IV (poorest), III, II, and I (finest quality).It is a measure of a given substance's transparency (, the ratio of light intensity passing through sample to that of the incident light) to a given wavelength of light.Namely, ISO 3632 deals exclusively with saffron.Other metrics include floral waste content (i.Saffron samples are then assigned to one of these grades by gauging the spice's crocin content, which is revealed by measurements of crocin-specific spectroscopic absorbance.Saffron types are graded by quality according to laboratory measurements of such characteristics as crocin (colour), picrocrocin (taste), and safranal (fragrance) content.the saffron spice sample's non-stigma floral content) and measurements of other extraneous matter such as inorganic material ("ash")
Edited sentence: Absorbance is defined as , with  as absorbance (Beer-Lambert law) and indicates degree of transparency (, the ratio of light intensity exiting the sample to that of the incident light) to a given wavelength of light.Determination of non-stigma content ("floral waste content") and other extraneous matter such as inorganic material ("ash") are also key.Grading standards are set by the International Organization for Standardization, a federation of national standards bodies.ISO 3632 deals exclusively with saffron and establishes four empirical colour intensity grades: IV (poorest), III, II, and I (finest quality).Saffron is graded via laboratory measurement of crocin (colour), picrocrocin (taste), and safranal (fragrance) content.Samples are assigned grades by gauging the spice's crocin content, revealed by measurements of crocin-specific spectroscopic absorbance