How do I improve the blue color of my cyanotype prints?

Cyanotype print color shades can vary vastly not only depending on the specifications of each batch of chemicals, but also the mixing ratio, time it was mixed, surface it is used on, paper quality (Some papers are coated, which do not produce good prints at all and some are chemically treated, which can interfere with the printing chemicals) the exposure time also plays a HUGE role in the depth and intensity of the blue you will get on your print. For this reason it is suggested to make use of test papers to make small prints with and note the details of what you did on the back of the print. Also note that prints do change until they are fully dry. So allow them to dry before making final observations. Should you choose to print on a canvas, make sure to used uncoated canvases only or your chemical solution simply won’t stick or produce a poor print. Personally I have found coating a canvas more than once to produce a better outcome due to the thickness of the material it’s used on. All three of the below prints were done out of the same solution batch, but with different exposure times.