Hi guys

I need some help here. I am sorry that i have troubled you all with my disc brake questions so far. I had my brakes bled 2 weeks ago by my LBS , Team-Skene at Cardiff,UK. The brakes work however they dont have full power....the front cant lock yet...wereas the rear can lock if dirty and not cold. Anyway.
Yesterday i opened the reservoir cap to add some oil and i noticed that the color of the oil inside the reservoir is different than the shimano oil that i have in bottle. Shimano OIL is kind of red color while the oil inside my brakes is like a natural oil-color. I have noticed that at the LBS as well when they bled them. I am mostly concerned with the possibility that the bike shop bled my brakes with DOT rather than mineral oil... they said they used the shimano bleeding kit however...Anyway i added some red oil in the reservoir and it mixed with the existing oil...Can i tell if i have DOT or mineral on my system? Its Deore XT so its supposed to have only mineral in it. The oil smells a bit like baby oil...and i need some help here ...thanks guys ....i ll appreciate quick responces because they got me very nervous and its sunday and everything is closed here.