This is an alkaline process which will remove the surface layer of the component. The longer the immersion the greater the metal removal. This process results in a fine ‘matt’ finish. It should be noted that this finish will change dimensional tolerances on surfaces including holes and this should be kept in mind if specifying such a finish. We use a common 'nothing on, nothing off' technique to maintain tolerances, this is subject to prior sampling and agreement.  Please contact us if you have any queries in relation to this.  It is also worth noting that this finish will not remove or disguise deep mechanical damage.