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Caustic soda is whats in over cleaner and removes anodising from Aluminium. You need to be careful with it, it's nasty stuff, so glasses, long sleeves and gloves are a good idea. Also you need to protect any threads on the Frame as it can and will eat away at them if you leave the frame in it for too long. Bear in mind that once you've removed the anodising the aluminium will oxidise and go dull reasonably quickly

Fair enough. I wonder how they came to that conclusion? What's made them think it was like that?

🤣🤣🤣 it’s complete bs.

The only experience I've had with this was a few smaller components, headset, cranks etc. I used an oven cleaner solution with hot water and left it for around 20 minutes, checking on it periodically. It removed the anodising from the parts completely, even in the hard to reach places.  As for quantity I used roughly 50ml in 1L of hot water, but I suppose you could add more if it's not effective enough. I cant see it causing any issues as long as you remove it as soon as it's free of the colour and rinse it thoroughly afterwards. It will start to etch the aluminium if left too long! As I said I haven't done anything as big as a frame, but I'd personally recommend getting a big enough container to fully submerge it and turning it over periodically to ensure the solution is getting all of the frame.

Hello in the group  I've seen some of the fantastic 'raw' work people do here on TF to de-anodize parts and frames   I have a anodized frame that I want to raw.    I've de-anodized a couple of small parts in small containers with luck, but a not a whole frame.    Would you mind sharing some tips for a good result on large items?    Like, does the frame have to be fully submerged in the bath or can I like, do half'n half without any transition in the final finish in a smaller container?    What ratio/concentration did you find works best for caustic soda/water? And also would you recommend hot water?  And also, would actually suggest oven cleaner instead of caustic soda solution?      Thank you very much for any help on this one!    Greetings from Denmark    Anders Kolpen