even margin with the anodized aluminum portion of the vessel application_number US 50770409 A description referring to fig1 through 5 wherein like reference numerals refer to like components in the various views there is illustrated therein a new and improved anodized aluminum cookware with exposed copper generally denominated 100 herein one method of creating a cookware vessel with the appearance shown in fig1 and fig2 is to anodize the vessel 100 after attachment of a copper base or cap layer 130 as well as a final stainless steel cap 120 to the bottom of the aluminum vessel 110 this leaves the interior of the vessel 110 a and the exterior portion 110 b above the copper layer 130 with an exterior of alumina or an aluminum oxide coating 115 which has a matte grey color however as the anodizing treatment occurs by passing current through the vessel in a hot concentrated sulfuring acid solution the none aluminum portions of the vessel i e the copper and stainless steel should be masked to avoid their undesirable and extensive corrosion in this media while the masking can be painted on the stainless steel cap 120 and exposed ring of the copper base 130 very precisely this is time consuming it is far easier to cover the base with a conforming rubber base or boot 310 as shown in fig3 a as any misalignment in the boot or variations in manufacture of either the boot 310 or the article 100 might leave some portion of the base exposed the boot can be slightly oversized to cover a small extra portion 113 of the aluminum this produces a portion of the aluminum 113.