Blotched Leather With Fiebings Pro Oil Dye

[Schpacko]

Hi Guys

I am recently having a problem that drives me insane.

I dip dye all my stuff with Fiebings Pro Oil Dye that is diluted with denatured alcohol to 40% - 65% of the original strength. This usually works great. But i when i dye thin (around 3 oz) vegtan, it sometimes looks like this (see image). funnily enough, i have never had this problem with the exact same leather in 5 oz or above.

Any ideas what the problem is?

[Northmount]

Hard spots in the leather, or the dye beginning to soak through from the back. Try leaving a sample in the dye longer to see if it all turns darker more evenly, or pull it out sooner before it has soaked through. These are guesses so you'll have to try another experiment!

Tom