retention capability 34 is meant the relative capability of the shroud to hold the moisture in the carcass as reflected by the following carborundum stone test shroud fabric samples are cut into pieces about 63 4 in u00d7 8 in 17 14 cm u00d7 20 3 cm sixty milliliters of distilled water are absorbed into each of two carborundum stones 6 in u00d7 2 in u00d7 1 in 15 24 cm u00d7 5 08 cm u00d7 2 54 cm the fabric specimen is wrapped around one of the stones and secured by straight pins one stone is left unwrapped to use as a control the stones are hung by a string and weighed then they are hung in a conditioning chamber at 70 u00b0 f 38 u00b0 c and 50 percent relative humidity for a given period of time unless otherwise specified simulated carcass relative moisture retention as used herein reflects a conditioning time of twenty hours simulated carcass relative moisture retention capability mrc is determined as follows equ1 as used herein the words 34 major portion 34 must be construed very broadly because fabrics can be constructed of any percentage of various component fibers or filaments and variations therein will affect the product only in a matter.