Dear Dr. H,
Would it be safe to cook up at home, load the shot and save it for later? I'm going to an amusement park where they check your bags. What I wanted to do was get everything ready at home, cap the needle - and when I get there, before going into the park, slip away into a restroom, do my thing, recap, tape it up so its all safe and sound, and enjoy my day... Is this okay to do? Thanks.
Doper at the Amusement Park
To answer your question: Maybe. I have noticed that the solution tends to break down and the syringe will be filled with "sediment" or particulate matter. If you do this, cool the solution first and then filter very well. This should keep this to a minimum.
Another related issue has to do with the solubility of heroin in water. If you prepare a very concentrated solution, part of the heroin will precipitate out when the solution cools. To avoid this, simply keep the concentration relatively low.
I have never heard of injecting small amounts of this kind of solid material hurting anyone, but there is no doubt that it could. What's more, a small practical lodged in the wrong place could kill you; this is unlikely of course. Doing heroin--mostly because it is illegal--is inherently dangerous. When one uses it, he must acknowledge and manage the risks associated with it. This particular risk is like the risk of getting AIDS from a mosquito: you can get AIDS from a mosquito, but there are more important things to worry about.