TM 1-1500-204-23-6 • Heat number • MIL-T-9046. • Thickness in inches (2)   Bars,  forgings,  and  forging  stock  Mark  in  rows  of  recurring  symbols  at  intervals  not  greater  than  2  feet throughout its length, giving the following information. • MIL-T-9047 • Class number (as applicable) • Manufacturer's name or trademark • Heat number • Commercial designation. Table 4-9.  Cross Reference of Old and New Color Code First digits, Old color steel No. (broad stripe) New color 10 Red Blue and Black 13 Red and Yellow Blue and Olive Drab 23 Yellow Green and Olive Drab 25 Yellow and Green Green and Orange 31 Green Olive Drab and Blue 40 Green and White Yellow and Black 41 Black and White Yellow and Blue 43 Blue and White Yellow and Olive Drab 46 Red and Black Yellow and Red 61 White Red and Blue 86 Black and Yellow White and Red 87 Black and Green White and Maroon Last digits, Old color steel No. (narrow stripe) New color 00 Red and Black Black and Black 10 Red Blue and Black 12 Red and Green Blue and Green 15 Red and White Blue and Orange 20 Yellow Green and Black 25 Yellow and White Green and Orange 30 Black Olive Drab and Black 35 Black and White Olive Drab and Orange 40 Green Yellow and Black 45 Green and White Yellow and Orange 50 Blue Orange and Black 55 Blue and Brown Orange and Orange 60 Brown Red and Black 65 Brown and White Red and Orange 95 Olive Drab Gray and Orange 4-19