Hi All:
I would like to tap your brains on the problem with my bag.
I just bought a preloved vintage classic flap (2 series). The lambskin leather looked 'dry' and has a brittle/whitish on the surface.
Did you try to determine what this brittle/whitish substance on the surface was? Could it have been mold? Was it raised or sunken or flush with the leather surface? Did you treat the white substance with anything before you began?
{ Kind of like my skin during winter

} I thought the leather needs nourishment badly. So, thinking that I had learnt enough from the forum here, I went ahead with my rescue project. My partners-in-crime are the Cadillac Boot & Shoe Care and Meltonian Delicate (170).
As always advised by tutu, I did a patch test on a small area inside the flap and waited. An hour later, it looked fine.
It's always best to wait 24 hours, as that allows the leather to dry, and the full effects of the substance you are applying to finalize, so that you'll see the results fully. I'm glad that you did try the patch first, though, just give it longer.
And so I went ahead. Here are pictures I took with my iPhone. The first two pictures were the BEFORE and the rest are AFTER. As you can see, the bag has turned a shade darker. This is fine with me and the leather feels smoother too. BUT, if you look closely the last 5 pictures, the color distribution seem uneven.
Look closely at those first two photos again. I see uneven color distribution. Was this bag previously dyed or touched up in any manner? I see so many bags on ebay that are either fully dyed a new color or else patched up to look more "new."
And it is prone to scratches too - the 5th pic was a marking made by the chain strap and no matter how I massage that spot, it is still there. And the last picture next to CC demonstrates the original problem.
Any leather is going to be "prone to scratches" but with lamb, you can usually rub them out (not so for calf [i.e. caviar)]. That last photo has me again thinking that your bag may have had some kind of coating, whether mold or salt or something. Where did it come from?
What do you think I should do now. Give it another one over of Meltonian Delicate? Send it to a Spa? I don't want a dye work .. Try another product e.g. LMB?
The first thing you need to do is find out what that whitish coating is on the bag, and that will determine the next step. If it's mold, that has to be treated, as it won't go away and will come out from under anything you put on top.
OR maybe this is how vintage lambskin behaves?
No, it's not, and should not behave this way. I have a vintage white series 1 bag, and it doesn't do this.
Any input will be greatly appreciated. Thank you