I recommend signing up over at the forums to learn more about it.
: DCheck out my other leather ibles for more leatherworking basics: I also like to keep extra paper towels and water on hand for clean up!
You might need to apply a second coat with full strength dye to cover any blotches that occur.
If you want a more muted or antique finish, you can dilute your dye and do many thinner layers until your desired saturation is achieved.
You don't want to apply so much you get a dramatic change in the color, just a light coating. The way you choose to use your dye depends entirely on your projects.
If you want bold distinct color, going full strength will get you that.
Once you've dyed the leather and it is ENTIRELY dry, you can add a wax based conditioner or more of whatever oil you like. Antagonizer has an awesome instructable up over making your own leather conditioner/polish.
Above you can see the following concentrations of dye: Everyone has their own technique here, but I like to use old t-shirt fabric to apply it to the flat surfaces. I tried many different ways but a soft t-shirt did the job perfectly.After playing around with it for a little, I found out what worked and didn't work for me, so I thought I'd summarize it all here.: DDyeing leather isn't tricky, but it is a little about trial and error.You may need to do a bit of testing to see which one you prefer.Water-based leather dye is my go-to because I feel that is more forgiving on the leather and it's easy to clean up with soap and water. Groove the leather, fold it, bevel the edges, punch out larger holes.