Can Safe Paw or Safe Thaw Cause Dark Spots on Concrete?

One concern that occasionally arises among users of ice melt products is the appearance of dark spots or discoloration on concrete surfaces. When you’re using pet-safe, chloride-free options like Safe Paw or Safe Thaw, it’s fair to wonder: Could these dark patches be caused by the product itself?
The clear answer is: No. Safe Paw and Safe Thaw do not create black or dark spots on concrete. If such discoloration appears, it’s more likely due to oxidation, previous product buildup, or natural mineral deposits in or around the concrete—not the deicer.