IMO, any coke with even a small amount (5-10% ) of speed in it is crap. It's often done because taking larger amounts of coke cut with speed, or following a single dose of speed, tends to knock out some of the effects of the speed - for a while. This is due to both substances having quite different pharmacology.
Theoretical coke and meth synergy question
However, when the coke wears off, you're left speeding, which amounts to a shit coke comedown IMO.
If coke is cut with speed, the speed will likely be amphetamine rather than meth as it's shorter acting and so less noticeable ( but still very noticeable IMHO). Remember, it only takes around 20-25% coke for it to give coke it's numbing effects and dominating bitter taste. And it should not be forgotten that other local anaesthetics also create a similar numbing effect.
Rumour has it that some 'coke' circulating in these parts has been cleverly mixed up from a combination of easy to get ingredients and contains NO coke at all, but it supposedly fools all but the most "coke acquainted". Lignocaine is probably the principle numbing agent that's used, and by adding the right amount of speed and other vitamins/nutrients/ pharms, the effect is supposedly a sharp, fast high with just the right amount of numbing. A couple of self proclaimed experts picked it right away though, saying the most convincing part was the lack of a typical numbing effect in the back of the throat. This is usually noticed as a portion of the insufflated coke runs down the back of the nose.
I wouldn't touch this local stuff with a barge pole. Still, if it's being sold as coke and contains nothing more than the substances mentioned, then someone is making big bucks, that's for sure. Just make sure you test any coke you're intending on obtaining with Marquis reagent. Next to pure coke will go a very faint pink colour, but only after it's been left standing for several minutes. A quick colour change to a pale orange indicates the presence of speed.
Perhaps the supplier of the pink product wouldn't mind if it were cleaned up before it was purchased. i.e. remove the amphetamine and pay for what's remaining....mmm... somehow I doubt it very much
The procedure can be found on this thread by Le Junk
Removing amphetamine from cocaine
LittleHedgehog I would suggest you edit out your question on local availability or the thread will be closed.