As a general rule, the quality of coke most people in Australia get runs at about 10-30% purity.
Unfortunately most of the purer stuff is hoovered up by the people at the ASX and in the fashion scene. The rest of the people down the chain get ridiculously cut shite.
Chances are, being a first time punter the charlie you recieved had been stepped on more times than the floor at a Tap Dogs concert, as for the numb feeling... a DD has probably cut with a little Novocaine, this is a very common practice due to the availability of Novocaine.
For those who don't know what Novocaine is-
Excerpt:
Cocaine was widely used as a local anesthetic after Carl Koller (1857-1944) demonstrated its effectiveness in 1884. By the end of the 1800s, however, the addictive properties of cocaine had been recognized. Doctors, realizing they needed to develop substitutes for cocaine's active anesthetic ingredient, carefully studied the exact chemical structure of cocaine. Many of the first synthetic cocaine products that were developed were too irritating to be of any practical use. The first successful substitute was Ernest Fourneau's (1872-1949) stovaine, discovered in 1904.
Fourneau's product was soon followed, in 1905, by procaine, the discovery of German Alfred Einhorn. Einhorn gave his substance the trade name Novocain, from the Latin novus ("new") plus cocaine. Introduced by Heinrich Braun (1862-1934) in 1905, novocaine soon showed that it had all the positive effects of cocaine with none of that drug's drawbacks. Guido Fisher popularized Novocaine, or procaine, in the United States. Injected by needle Novocaine immediately became popular as a local anesthetic for both medical and dental purposes
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"If Kerpal was a cop, I'd kick his dog..."