Aging aulminum heads

[aonemarine]

Dip in ferric chloride for about 10 seconds, remove and rinse. Boom instant patina.

[Ol' Ron]

I usually concern myself with the combustion chamber shape and the clearance over the valves and pistons. I don't much care what they look like, I worry about performance.

[fortyonerag]

I used to just hang stuff in my garage (aka the wonderful world of corrosion) until I was ready to run it. I think possum urine was the secret, but I aint saying' for sure

[Bored&Stroked]

Originally Posted by fortyonerag

I used to just hang stuff in my garage (aka the wonderful world of corrosion) until I was ready to run it. I think possum urine was the secret, but I aint saying' for sure

My secret is a mixture of Cat Pee and Raccoon Turds . . . . gives a kind of yellowish-blown patina look. But the smell! LOL

[Chuck Sea/Tac]

Yes, I think I'm down wind. Wrap it up, will ya.!

[5851a]

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Not sure what the ingredient is but Castrol super clean will turn aluminum to gray. The longer it's in it the darker it get. I wouldn't recommend for machined surfaces, it will take a layer of skin off if you don't wear gloves.

[hardtimes]

Originally Posted by fortyonerag

I used to just hang stuff in my garage (aka the wonderful world of corrosion) until I was ready to run it. I think possum urine was the secret, but I aint saying' for sure

Yup, possum fat and urine !
However, the 'best' at screwing up ...er patinaing aluminum...is mouse piss !! Caveat..when left on tooo long, it will eat alum into oxide/pits