A little will make it look darker, but when too much dust going to look horrible....hhahahhaha
Upgrade to better friction pads and slightly higher working temperature will be good, like your 550 deg. for street use. Last time newbie time listen to spare part shop use 800 deg pads, cold time no bite at all, so for daily is really hard to use. However they are really good when heated up so is good for track only....
Hahaha, for me I can leave my rims unwashed for weeks until they're very dark & dusty!
Yup, that's why I said for street, not those for racing use.