That's very unusual if the white eventually goes clear it could be there's oil like compounds still on the crystals or powder such as toluene/xylene or it could be some cutting agent which doesn't sound good if it won't clear up.
I don't know much about I.v.ing stuff but I'd recommend against it.
Had a 'friend' who used to cut amphet and coke with baby formula.... only found this out when I tried to wash back the coke and it looked like milk! possible explanation?