What should I use to ink spec's on bow limb?
Pentel brand "Slicci" pen works well in gold or silver.
For the neatest job an extra fine calligraphy pen and archival white ink is best.
(http://img.photobucket.com/albums/v181/ekrewson/bow%20making/caligraphywriting.jpg)
I'm with Eric on this one. It works well.