don't worry about it being at min level, it is only the overflow and will get more in as the engine heats up.
any car after 1998 will use OAT (organic acid technology) or the universal stuff is HOAT (hybrid organic acid technology). - this is just the anti-corrosion part of it, the base is still glycol. Don't use oat or hoat in cars with soldered radiators or the acid will dissolve the solder, so it can't be used in classic cars.
the colour doesn't mean much it is only there in case it leaks to make the leak show up better, both Glycol (and alcohol) and corrosion inhibitors are clear so they have to add colour. Strangely enough if you add too much anti-freeze it actually freezes quicker, between 50 and 60% gives best protection, above and below that figure and freezing point is higher. The Glycol bit that stops it freezing doesn't wear out, it is only the corrosion inhibitors that get used up (a bit like engine oil really. the oil doesn't wear out it is just the acid buffering chemicals that get used up).
if you mix Halfords (orange) advanced anti-freeze with existing Honda (green) unless you flush it out fully you will get a sort of brownish colour, I did a full flush on a system years ago and it took weeks to get the air bubbles out (the heater didn't work properly for ages), so now I just drain out what's gonna come out on its own into a measuring jug, (normally about half - 2 litres comes out unaided) and then make sure that
amount of premixed goes back in (with 50% distilled water - NOT DE-IONISED water which will scavenge the ions back from the metal in your cooling system) - then I do it again a second time after it has been in for about a week, and you may have to top up during that week - call me lazy but i have never had a problem.
