The first documented professional tattooist in Britain was established in the port of Liverpool in the 1870s. In Britain tattooing was still largely associated with sailors  and the lower or even criminal class,  but by the 1870s had become fashionable among some members of the upper classes, including royalty,   and in its upmarket form it could be an expensive  and sometimes painful  process. A marked class division on the acceptability of the practice continued for some time in Britain.  Recently a trend has arisen marketed as 'Stick and Poke' tattooing; primitive figures are permanently inscribed by the user himself after he obtains a 'DIY' kit containing needles, ink and a collection of suggestions. 
You may want to identify certain types of equipment by vendor name and brand or category (., ultracentrifuge vs. prep centrifuge), particularly if they are not commonly found in most labs. It is appropriate to report, parenthetically, the source (vendor) and catalog number for reagents used, ., " ....poly-L-lysine (Sigma #1309) ." When using a method described in another published source, you can save time and words by providing the relevant citation to the source. Always make sure to describe any modifications you have made of a standard or published method.