An increased ACTH result can mean that a person has Cushing disease, Addison disease, or ectopic ACTH-producing tumors. A decreased ACTH result can be due to an adrenal tumor, steroid medication, or hypopituitarism.
All fabrics will burn, but some are more combustible than others. Untreated natural fibers such as cotton, linen and silk burn more readily than wool, which is more difficult to ignite and burns with a low flame velocity. The weight and weave of the fabric will affect how easily the material will ignite and burn. Fabrics with a tight weave - wool, modacrylic, 100 percent polyester and those that are flame-retardant treated are good choices.
JUST be careful with how you dispose of the rags.. rags soaked in linseed oil can and will spontaneously combust, I've seen it happen, but yea, that is a good idea.... we rub down my dad's bob-sled everyonce in a while to preserve the paint and patina... although it is wood but the linseed does work on the metal parts as well.. the only thing is it gives the stuff with the surface rust a wet look.