Disclaimer: I'm no expert at all and I have never owned or dyed a Chanel, so please keep that in mind.
I take an old,
soft white cotton tee shirt, or cotton cloth, and I rub
gently, in circular motions in one direction only. I go over the whole bag. Leave it for a day to rest, then repeat.
Keep repeating this cycle with clean cloth each time until it stops bleeding completely. Try to be patient and don't rush. You don't want to accidentally scratch the leather with your nail or rub it so hard that it peels. Slow and gentle, with time to rest in between.
How long it will take depends on how much excess dye is on the leather. It will bleed until all the extra is out, ime.
Then I would correct the dye (if some spots are lighter than others, I would apply a little dye on those spots to fix), and after completely dry, apply the sealant to it to finish the job. Nothing should bleed before or after you apply sealant.
not with leather conditioner as you have been. The conditioner will help it bleed more in my experience.
There are many other ways to buff. Some people like to use horsehair brushes. I have only tried soft white cotton because I can feel the leather I'm buffing with my fingers that way and know I am not scraping it by mistake.
To seal? It is called Angelus Finisher. There is matte, normal, gloss, high gloss...pick the one you want depending on how you glossy you want the result to be. There are pictures on the Angelus site to help you choose. Your Resolene is also an excellent sealant, as I understand. The problem was that there was too much dye sitting on top of the leather to seal it, imo, so it all runs when you touch it.
Btw, there is also an Angelus product for sealing the dye on the metal logo (I forgot the name...it will be on their site. It prevents the paint from chipping off the metal).
I hope that helps. It's a beautiful bag and it is a shame you haven't been able to enjoy it all this time. I'm sure others with more experience than me will chime in. I know that many people have redyed their Balenciaga and
Coach bags, so you can definitely get more useful tips from our wonderful members.
If you are in any doubt, you should send it to a professional who knows how to handle Chanel. It may cost some money but this investment will allow you to use the bag for many years to come.