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Stainless steel, also known as inox, corrosion-resistant steel (CRES), and rustless steel, is an iron-based alloy containing a minimum level of chromium that is resistant to rusting and corrosion. Stainless steel's resistance to corrosion results from the 10.5%, or more, chromium content which forms a passive film that can protect the material ...
Various colors on stainless steel 18 Cr / 8 Ni 7.5 g of sodium dichromate , 1000 mL of sulfuric acid (1.24 g/cm 3 ), lead cathodes, object as an anode, 70-90 °C temp, 0,06 A/dm 2 , voltage 1.3 V – colors depend on the duration of the procedure (5-50 min.), brown, blue, reddish brown, yellow, green.
Many companies have stopped using red dye No. 3 in recent years. One is Just Born, the company that makes Peeps; it switched to using red dye No. 40, one of many synthetic dyes still on the market.
Allura Red AC is the coloring additive in this strawberry soft drink Allura Red AC in confectionery. Allura Red has been heavily studied by food safety groups in North America and Europe, and remains in wide use. However, chronic exposure to the dye has been shown to increase susceptibility to bowel disorders in mice. [11]
Toluidine red is an organic compound with the formula C 10 H 6 (OH)(N 2 C 6 H 3 (NO 2)CH 3). A dark red solid, the compound is classified as a azo dye consisting of a 2-naphthol group linked to a 2-nitro-4-methylphenyl substituent. [3] Toluidine red is a traditional pigment, found in oil paints. [4]
For example, a Type 304 stainless steel has a 0.2% proof strength in the region of 280 MPa (41 ksi), a 22%Cr duplex stainless steel a minimum 0.2% proof strength of some 450 MPa (65 ksi) and a superduplex grade a minimum of 550 MPa (80 ksi).