Cyanotypes

Cyanotype is a photographic printing process that produces a cyan-blue pint.  Engineers used this process in the 20th century to produce copies of drawings, as this method is very cheap, and these are referred to now as blueprints.  This process uses two chemicals;  Ammonium iron citrate and potassium ferricyanide.

Examples of this process are seen below.

An example of the cyanotype I created is seen here.

Chemigrams

To create this effect seen below, all you need is photographic paper, developer, and fixer.  Firstly, you need to paint/draw/do pretty much whatever you want with the fixer onto the photographic paper.  Once you have done this, place the image into some water for a couple of seconds, then put it straight into the developer.  For a few minutes, you need to 'agitate' the fixer, and to do this you need to move/create mini waves whilst it's in the developer, and this is the bit that actually makes the image develop onto the photographic paper.

  You may also have seen similar things which are 'taken' using objects instead of fixer, for example, see images below.