Please don’t follow the above advice.
It’s a very difficult & complex process, time consuming, frustrating, lots of dangerous fumes and you could permanently damage your bike parts.
It worrying that you are telling people to use Hydroflouric Acid, presumably you mean Hydrofluoric Acid, which according to the MSDS (it’s on the internet - look it up) - Fatal if swallowed, in contact with skin or if inhaled.
So when you say you haven’t got a source to purchase, this is why - skin contact can kill you, it’s not available to the public for a very good reason.
Not to mention that it’s the wrong acid to use anyway.
I appreciate your concern. Did you watch the videos I posted? What I do not appreciate are the nanny's prevalent in European politics that simply decide I cannot have 3 - 5% HF solution where if I were home in the US, I can walk into a hardware store and buy what I need, cheap to boot.
The vidoes I posted as well as Caswell for the dyes all urge caution AND go over safety precautions. All important and all part of the process. Burns and possible electrocution? Where do I sign up? Did you also know that mountain biking can be fatal? You swim in public pools? That is a ton of exposure to chlorine which is an absolutely terrible chemical, yet swimming is pretty fun and we're all still here. You drink city drinking water from the tap? Now you're ingesting chlorine and fluoride.
In the titanium video and that of others, everyone is using Wink rust remover. The main ingredient chemical is HF:
https://www.merrittsupply.com/wp-content/uploads/2016/09/Whink-Rust-Remover-SDS.pdf
A cursory search for "etching titanium" will reference HF solution.
Regarding aluminum, in my last post I referenced a far less hazardous chemical where as the video of the guy anodizing in his basement, uses HF.
What you find difficult and complex about anodizing, I find interesting and entertaining and there really is no mystery to the process. In the end, your opinion lends toward conjecture unless you have personal experience with anodizing. People asked for information and I provided personal experience. They can do whatever the heck they like with that info AND I am not bringing anything new to the conversation that isn't already on the internet. Simple as.
Thanks again for your concern.
I have Paul Thumbies that are black anodized, so I'll strip them and either dye them green, turquoise or 3dv purple. Haven't decided yet. These are small parts so if I am successful with those, I'll move to these black ano Tech Lite brake levers I have. Success or even being content will progress to redoing a few larger parts for a specific build.