Decided I wanted to do a series of minimalist chemistry Sherlock graphics.  I apologize for the Cyclohexane molecule as I had to draw it myself, so sorry if I got it wrong.  I’ve used the same colours as I have on my season/episode t-shirts because, as a synesthetic, that’s the colour each episode is.  Either that, or it’s a dominant colour in the episode.

A Study in Pink

Tetrodotoxin—frequently abbreviated as TTK.  A neurotoxin for which there is no known cure.  Relevance to the episode:  while not established as the method of death, I figured some sort of neurotoxin is probably what killed them.  Admittedly, I have no training in that area.

The Blind Banker

Dichlorodifluoromethane—Freon-12.  A common aerosol spray propellant.  Relevance to the episode:  spray pant was a definite feature of the episode, so I chose to use an aerosol rather than a pigment.

The Great Game

Pentaerythritol tetranitrate—PETN.  An explosive, found in, among other explosives, Semtex.  Relevance to the episode:  Semtex was Moriarty’s apparent plastic explosive of choice in the Game, putting several victims in bomb vests.

A Scandal in Belgravia

Dopamine—a neurotransmitter responsible for pleasure, including as a result of love.  Relevance to the episode:  This episode dealt with love on a number of levels, and I personally adore the break-down of love as a chemical reaction from the ending of the episode.  Probably the main factor in doing this graphic set.

The Hounds of Baskerville

Cyclohexane—a solvent.  Relevance to the episode:  Practically zero in reality.  It was one of the few in the screenshot of the HOUND experiment records I was able to properly identify (that had a large image-size reference molecular diagram), though it and all the other ones I IDd had practically no medical purpose—most were solvents or used in (if memory serves) the petroleum industry.  Why did my favourite ep have to be such a problem child?

The Reichenbach Fall

Calcium carbonate—a substance found in rocks and seashells.  Relevance to the episode:  One of the more common man-made uses of calcium carbonate is used as one of the ingredients in road paving.  This includes sidewalks.