I guess there isnt any, but in my experience, there is no noticable difference from different blends of changa and pure DMT, atleast not to me, unless there is salvia divinorum in the changa, which there often is, people cut their changa with salvia and pass it off as the real thing, atleast here in scandinavia, when i get that type of blend there is a major difference, but from one herbal mix to another its more or less the same, to the degree dmt trips can be the same
Copper has been used and cherished for around 9,000 years. Pots that are made of copper are ideal heat conductors; the material is durable, hygienic and corrosion-resistant. Above all, it is the excellent heat conductivity that makes copper a perfect base material for pots and pans.
Therefore corrosion of copper pipes and fittings incur significant costs. Fortunately, problems with copper corrosion are relatively rare and the cause is usually well understood. Problems include coloured (blue) water, pinholes in the pipe or fitting, and failure of copper hot water cylinders. History of copper pipes and products Copper pipes have been used for domestic water services for nearly 200 years. The introduction of copper pipes offered a stronger, lighter and cheaper alternative to lead. The first pipes, used in 1810 (Reference 2), were made from sheet metal.