If you haven't already known, Japan is one of the largest luxury resale suppliers to U.S., China as well as other global markets. Companies like What Goes Around And Comes Around and Heritage Auctions not only procure from Japan but have opened offices there so they can source locally. With billions of dollars worth of inventory from the past 30 years, Japan will continue to have its lion's share at least for the next couple of years.
With luxury resale consumers becoming more savvy, their tastes have evolved from hunting for deals to hunting for rarity. A vintage 20 years old black CHANEL double flap bag is no longer as sought after as a similarly aged pink CHANEL "Diana" flap bag, and their market resale values can be around $1,000 different.
Now more and more Japanese resellers are dying vintage CHANEL bags into a rainbow of colors in the hope to cater to a pickier taste. I personally would not purchase any vintage CHANEL bags with extensive modifications and re-dying is one of my biggest pet peeves.
First, CHANEL colors are very peculiar depending on ages and specific styles and every color comes in particular shades and a wrong shade will throw the entire bag off. In the banner photo, none of the shades are original CHANEL colors and they look cheap.
Second, even if the color is carefully selected, applying the right dying material and techniques is key to not to ruin a CHANEL vintage find. If you really want to re-dye your CHANEL, better bring it to a reputable refurbisher that has years of experience restoring a large amount of CHANEL bags. Depending on the materials (lambskin, calfskin, or caviar), the wear (discoloration, scuffs, or color transfer), and the age (construction details might change), the paint and technqiues can vary a lot. Some improperly re-dyed CHANEL bags can change their entire texture, instead of the buttery soft touch, the leather might turn flaking and overtime, it will acquire a shiny distressed look that almost resembles Balenciaga's infamous Arena leather. The below detail shots show that improper dying can damage the leather that is essential for a CHANEL bag.
Finally, would you say a re-dyed CHANEL bag is still an authentic CHANEL? In my personal opinion, if you change the color, you change the originality of the bag. It's authentic by definition but not so much so by resale value.
If you are hunting for a special color CHANEL vintage, spend the extra dollar you need to get a better conditioned bag in its original color. Most re-dyed bags are in very poor condition and have a lot of discoloration and re-dying is merely a technique to cover up the wears.