Whats your favourite chemistry and why?

[miha]

ILFOTEC HC, pushes HP5 very nicely.

 

[timor]

Hydric acid

Also known as Dihydrogen Monoxide. Even though each year, Dihydrogen Monoxide is a known causative component in many thousands of deaths and is a major contributor to millions upon millions of dollars in damage to property and the environment, it's very useful and I can't imagine photography - or my life - without it.

Good one
If you're concern with the dangers of it, use Polaroid, it will minimize the possibilities, that you will drown while making photography.

I use Polymax T for films and HC110 for papers (as an additive )

 

[Keith Tapscott.]

My usual film developer is D-76 and paper developer is either PQ Universal or Multigrade.
Ilford Stop-Bath.
Ilford Rapid-Fixer
A lot of Kodak Photo-Flo wetting agent which I was given for free.

My regular films are FP4 Plus & HP5 Plus, but I will be trying other films in 2014 and may be a different developer.

 

[Soeren]

Rodinal and Diafine. My visits to the darkroom are irregular and can be far between so I needed some developers that works well and are close to immortal. I like the way they make my negs look, the speedincreasing effect of Diafine and the versatility of Rodinal.
Best regards

 

[Soeren]

Hydric acid

Also known as Dihydrogen Monoxide. Even though each year, Dihydrogen Monoxide is a known causative component in many thousands of deaths and is a major contributor to millions upon millions of dollars in damage to property and the environment, it's very useful and I can't imagine photography - or my life - without it.

Also known as Diprotonium Oxide, nasty stuff, especially if inhaled but its also known to cause burns.
I use it daily for extractions from a brown granulate that originally comes from a plant of the Rubiacca family

 

[fotch]

D76 for film, Dektol for paper, indicator stop bath, usually Kodak Fix, with some experimenting, for 50+ years.