how to remove annodizing

[Gruff]

I have seen mention of it on here before but can't find the answer using search.
Can anyone help?
I need to remove some gold prior to getting re-anno'd blue.

 

[bulliporker]

oven cleaner

 

[dyna-ti]

Abrasive tongue ?

 

[lrh]

Caustic Soda from your local pound shop but go easy at first (start with weak mix, short time period). There's a few guides on YouTube I think.

May leave the part black and need a bit of sanding/polishing to get down to the raw alu.

 

[Gruff]

Abrasive tongue ?

I might be obsessed with retroness but not got to the licking stage yet.

 

[PeteC]

plus one for oven cleaner. 'easy off' brand in the US works well. but I'm sure any brand will do.

 

[Gruff]

Yeah, just watched a load of you tube vids, mainly from the US , looks pretty simple

 

[Smithjss70]

Easy Off is your solution. Depending on part surface area and shape will determine soaking time. If doing indoors at ambient temps (21C/70F) and as a reference, I have found that Ringle holeys can take about an hour to penetrate ano in fairly good condition. After soaking, rinse with warm water and use a wool brush to clear any residual color. I'm not a metallurgist, but the acidic cleaner can probably weaken the metal so I would be conscious of over exposing the parts.

 

[mrgumby]

Caustic soda (oven cleaner/sodium hydroxide) is a strong base (alkali).

After it removes the annodizing it will start on the alluminium underneath, be warned!

 

[Smithjss70]

Three warnings now on weakening aluminum.