Colour code for materials are used to avoid the mix up of
project materials during material take off, cutting and fabrication. Colour
codes are generally decided by clients and the details are available in client's project specification.If, client's project specification is silent about colour for mild steel,then manufacturer's colour coding system is applicable for mild steel material.Colouring material used for austenitic
stainless steel shall be free from chlorides, halides and zinc.
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If you want to know how well a broom works you do not ask the guy selling the broom or the guy who designed the broom, you ask the guy using the broom.