Magnesium sulphide, MgS, may be obtained, mixed with some unaltered metal and some magnesia, as a hard brown mass by heating magnesia, in sulphur vapour.
The second addition is the new Specialist Science logo, and the third an old enamel pin badge worn by MGS prefects.
Another factor common between owners of older and newer MGs is the time, effort and money lavished on the cars.
There were rows and rows of MGs from early Bs through Limited Editions including midgets.
The images MGS has transmitted to Earth have much higher resolution than those obtained by the viking orbiters in the 1970s.