Yeah, the color should be last if you possible cant get the color back, most times you can. I loved using Obenauf's LP and oil on mine but I have the brown 1k and Stockton, both are dark already. So, it might turn your rust 1k's a couple shades darker. It tends to lighten up a bit after a few days, but it still might be a little darker. I have seen people complain that the oil darkens a bit more than the LP, but they might be putting a whole lot on.