Oh sorry, didnt' mean health risk, I meant long term issues with the emitter. I'm thinking this: take it out of the gas, solder the leads - poof! Or leaving the gas on to evaporate, maybe it would leave a film of chemicals behind, causing bad effects weeks/months later? -- that kind of effect. By "care/treatment", meaning clean-up, spray treatments (LED seal or whatever). But what you are saying nothing is needed, and after one year, no long term effects. This is getting better and better! Looking back now, why did I go so off track? This seems to be the best and easiest way by far, at least for me and many others I assume. Now it seems like the only issue is deciding whether to do it or not - yes there's some risk of damaging a $10 LED (plus s/h) you waited 4 weeks for (the risks though seem less than I thought), but you also have to decide whether the smaller tighter beam, less light in the flood, warming the tint is worth it for the double effect on candelas. Making that decision is easy easy once you understand all the pros and cons.
Putting a XP-G in gas oil for 24 hours works fine.
The dome did not fall off by itself though. What happened was that I thought it had not worked so when I took it out of the gas oil i poked the dome with my finger to feel if it had gone soft at all. It had not really but it just slid off!
I then sprayed the die with electro cleaner for a few seconds and that removed any gooey stuff that was left.
Initially worried that I might have broken the bonding wires with my thick fingers I hurried to test it out with a battery and it works.
Thank you very much to the OP and all others who have contributed to this thread and the knowledge we now have. TY! :-)
I found here on a dutch forum that an electronics guy used petroleum-ether to remove silicone remains. I have some here where I work, I will give it a try. The composition is not far from gasoline, but it is much cleaner. It is even more equivalent to Coleman Fuel (which is also much cleaner than gasoline).
I doubt that it will work. It is a pretty mild solvent. Good on sticky residue from tape and tends not to harm most plastics. I use it for polishing plastics and LED display windows with red jewelers rouge.
The petroleum-ether I have here says: 100-140°C. I may have some Coleman Fuel as well somewhere. Perhaps when I can find some time and enough spare leds I will do a 'great dedome test string' one of these days..
I never had any luck with the XRE twist, always some bad residue left behind. And removing those always a mess. My success rate is only 33%, 1/3 - one ruined wire, one bluey, and one not-so-good-but-I-leave-it-alone-anyway-otherwise-rate-would-be-0/3… heheh.
With petrol soak, the whole ring and dome just slid off. I have 100%, 1/1 success on this method for XRE. Best, cleanest result out of the four too.