I echo FierceKitty's comments. Lacquer was universally used as a protective coating on wood, leather and metal armour and weapons. Lovely though these models are the nagae-yari would almost certainly have had lacquered bamboo shafts, almost certainly black or red or a combination thereof. The Japanese seem to have favoured black to the extent that it is a rule of thumb among arms and armour collectors that red lacquer is indicative of Chinese weapons and black to Japanese.
The 'Russet' browning of metal armour FierceKitty refers to was a heat treatment which created an artificial patina/barrier on the metal. It was however prone to wear and was largely reserved for parade/display armours and was never routinely used.
Munition grade armour components of the Sengoku-Jidai were also lacquered and that extended right down to the Ashigaru.
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