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How are you going to say it's less pure? When you cook it up all the cut stuff goes to the bottom.
Not necessarily, any active cuts such as ampethamine or ephedrine will also be freebased and much will remain with the 'crack'. In order to really purify it you have to wash the crack with distilled water and filter it. The water can be discarded because amphetamine and ephedrine freebase are water soluble, freebase cocaine is not and will remain in the filter.

yeah i have established how to make it now . it's pretty simple . I don't have a glass pipe to smoke it so how should i smoke??
Depending on where you live you may be able to go into any gas station or convenience store and find on the counter "rose tubes", likely next to the lighters. These are long glass tubes with cheesy plastic roses in them, you can discard the rose and stuff one end with steel wool or 'chore boy' as a filter. Put the rock in the end with the filter, heat with a lighter while turning the tube and inhale. Don't put the flame directly on the rock as the object is not to melt or burn but vaporize it.