Control of reflective properties of flake metal products
Laboratory scale atomisation/milling trials have established that the surface characteristics and the reflective properties of flake metal products depend critically on the shape of the powders before milling. For both pure iron and austenitic stainless steel flake particles, superior reflective properties were recorded for flake with smooth surfaces and rounded outlines produced by milling spherical powders, compared with flake having rough surfaces and jagged outlines obtained by milling irregularly shaped atomised powders. The importance of controlling flake morphology and reflective properties is demonstrated by the outstanding quality of the fingerprints which could be revealed on light or dark backgrounds of various textures using the pure iron and stainless steel flake products.(Author abstract)
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