Depending on the grade of stainless you will obtain a grey to Black finish. This can be repeated for the desired effect. Ensure the component is at 27c or above or it will not accept the solution as well.Stainless Steel Blackener is an acidic liquid concentrate used full strength or diluted with up to 3 parts water to blacken stainless steel at room temperature. Recommended for colour coding parts and blackening engravings on stainless steels. Produces a pleasing dark gray/black finish. Seal with beeswax or wd40. Contains Hazardous Goods.All Goods Sent By Royal Mail 48(UK)Where Possible or a Tracked Service Evri/DPD/FedEx For Peace Of Mind