When I was a lad, we used to sing a song about it...
"The moon shines bright on Charlie Chaplin
His boots are crackin’ for want of blackin‘
And his owd fusty coat is wanting mending
Until they send him to the Dardenelles"
I did this post some time back on the Ariel owners forum on how to hot parkerise (blacken) parts at home. This was the process used at the factory, they called it Coslettising and it was also used on mudguards etc before they were enameled. A bit long winded to do.
I've also tried some black etch primer with a coat of oil...looks very similar quite resistant to spannering and can easily be touched up with a small paintbrush.
When I was a lad, we used to sing a song about it...
"The moon shines bright on Charlie Chaplin
His boots are crackin’ for want of blackin‘
And his owd fusty coat is wanting mending
Until they send him to the Dardenelles"