Hi John
The scale armour is done with a pen very simalar to a ball point,
marketed by "Pentel" and available in art shops or stationers.
I have their Gold, Silver and a Copper colour.
After first painting the armour overall in a dark brown, I applied
the gold using the pen to the uppermost surfaces. At this stage it looks
unrealisticaly bright. I then apply washes of Citadel inks to tone it back.
The following colours were used Flesh wash, Dark Brown, Orange Ink
first individualy then in mixes for graduation of tone (visual blending)
If overdone, restore the gold by scribbling the pen on a piece of scrap
plasticard Then lift up some of the colour with a damp (saliva coated) brush
and re-apply
Hope this Helps
Frank