Hydrogen is a colourless, odourless, tasteless and non-toxic gas that is the simplest of the chemical elements, consisting of a single proton and a single electron. There is currently a huge amount of media attention about hydrogen, which reference it being many different colours such as blue, grey, green, pink etc. As molecular hydrogen doesn’t typically exist in nature so needs to be generated by a process; these hydrogen colours mentioned in the media do not have different characteristics or chemistries but describe the process by which the hydrogen is formed. The hydrogen formed is still completely colourless and it actually burns with a very pale blue flame, which is almost impossible to see with the naked eye in daylight…so what do the different hydrogen colours really mean? BROWN – Brown hydrogen is produced from coal through a process called gasification, which involves heating the coal in the absence of air and gives off substantial quantities of carbon dioxide as a by-prod...