recrystallizing MXE Hcl can be done from a saturated solution made with hot (boiling) water and gives satisfactory results, especially if done on a gram or more
It helps if you can e.g. do a TLC plate first to determine approx. how many other cpds your material is (if it is one substance and its consistent with MXE, you gain nothing by recrystallizing aside from pretty crystals, and every recrystalliziation will incur at least SOME material lost.just because it has some coloration to it, you cannot reliably deduceby color/texture alone if its a PPM impurity of something very dark or, worst case, if it is 100% some other drug entirely.