- Clipping hairs with a small pair of facial scissors is an option for women with few unwanted hairs. - Chemical depilatories (hair removal creams) are another option for hair removal. However, their major drawback is that many individuals find them too irritating to the skin. Bleaching creams may be used to camouflage hair instead of actually removing the hair.
Black oxide is a conversion coating formed by a chemical reaction produced when parts are immersed in the alkaline aqueous salt solution operated at approximately 285 degrees F. The reaction between the iron of the ferrous alloy and the hot oxide bath produces a magnitite (Fe3 O4) on the actual surface of the part.
An important feature of black oxide is that it does not form white rust over. time - a feature common to some electroplated finishes. Since the formation of white rust crystals is a risk factor for. electrical shorts, black oxide fasteners are often preferred in the electronics industry. The risk of material failure due to hydrogen embrittlement in case hardened fasteners is virtually eliminated when finished. with black oxide.