I've been using this stuff for years. https://www.ebay.co.uk/itm/220485088736
I think they do a 'super black'? I don't know if there is a better product? I usually give each piece about 3 goes. Ron
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"
The bottle looks familiar but I'll check what I have to be absolutely sure and post here this evening...
I have found the results are best if the parts are bead blasted first to provide an absolutely clean surface...If not, then degrease fully with clean paint thinners or similar and avoid greasy finger marks!...
One application usually gives a good black finish for me but as this product seems to be acid based follow the washing off/oiling instructions after application or rust will soon appear....Ian
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"