Ok, I'm not a blacksmith, but in the course of clock repair and restoration, I sometimes come across clocks that had faux bronze finishes applied. I just found a new recipe I'd like to try, but I need to know the correct temperature to create the finish.

In the recipe, the oven should be hot enough to turn a raw cast iron piece straw yellow to light blue. Can anyone tell me what degree of heat will do this? Thanks, Chris.

Did the recipe specifically say cast iron?

Here is a temper color chart. It should be relatively close for all ferrous metals.

http://www.anvilfire.com/FAQ-article.php?bodyName=/FAQs/temper_colors.htm&titleName=Temper%20Colors%20:%20anvilfire.com