It's amazing the difference in grip available from various tyres. Cold, greasy roads highlight the different characteristics. My Equipe with the original 25mm Vredestein's from 1988 grip better than semi-slick Vittoria MTB tyres ! The Vittoria's are extremely hard wearing, so grip was not at the top of the specification, but it's surprising nevertheless.
It's good to learn the handling of a particular bike / tyre combination. When conditions are slippery, I find it's always the front tyre that starts to let go. The first sign is the steering goes lighter... The moment I feel that sensation, I widen the radius slightly to ease the load on the tyre. It's best to get all your braking over before the corner. If you have to scrub some speed off mid-corner, use the rear brake - gently.
A front wheel slide is to be avoided at all costs - it will be very difficult to respond fast enough to stop the slide turning into a fall. A rear wheel slide happens slower, with a good chance of saving it by counter-steering which is the natural instinct.
I don't recommend tearing around trying to find the limits of man and machine

but it's useful to think ahead and use the feedback from the bike to alert you to problems.
Safe riding !