IMHO hinges were a dark coloration and many are restored too light. Also it might be misleading to say manganese phosphate was used or should be used for all nuts, bolts, fasteners, etc.... I looked at original parts and parts from suppliers like AMK (very similar in color) and decided the manganese was too dark for many small items.
Happy Holidays everyone!
Thanks Chick, but I didn't say all nuts and bolts etc. I was using those parts as examples of parts that would get that colour of finish. One should do the research and finish accordingly. Have a great holiday and Merry Christmas.