I just got a brand new leather Texas steerhide tote and tentatively treated it with the Kiwi boot protector.  It was already a dark brown and I made sure to hold the boot protector about 2 feet away and spray evenly,  then re-sprayed a hours or so later after the first layer had dried.  I did the same thing to my PINK leather realtree camo wallet and keychain.  None of them changed colors but I made sure to shake the bottle well and stand back which seems to have worked for me through the years.  None of them showed any damage in spite of getting soaked in the rain quite a few times.  I also treated my husbands light tan suede leather shoes with no damage - it started to get dark as I hadn't shaken up the bottle and I wiped it off the shoe quickly with a rag and everything went perfectly. All in total I treated 3 pairs of suede boots, a pair of leather DC gym shoes, tote, wallet, keychain, another wallet, leather sandals, leather chukkas and still have 1/4 of the 12 oz bottle left.  I sprayed all of the items about 3-4 times each from a distance, waiting about an hour before doing the next layer.  It smells awful so its best if you do in a outside, porch or somewhere you can get some fresh air circulating.  I did it in my walk in basement and opened the outside door the whole time in spite of the 30 degree weather as the smell is very strong.