1.1 This method describes a procedure for determining the colourfastness and dimensional change likely to occur in fabrics as a result of commercial laundering. 1.2 The boil method procedure for determining dimensional change is covered in CAN/CGSB-4.2 No. 24.1-M. 1.3 This procedure is recommended for materials that will normally be laundered by commercial methods where dimensional change or color change may occur as a result of the action involved in commercial laundering.