Hydrogen Colours

What color of hydrogen is produced by coal gasification, named for the bituminous or lignite coal used, and emits about 19 tons of CO2 per ton of H2?

Black or brown hydrogen

What color of hydrogen is produced mainly from natural gas by steam reforming, paired with carbon capture and sequestration, with a carbon intensity of about 1 to 4 tCO2/tH2?

Blue hydrogen

What color of hydrogen is made by water electrolysis powered by renewable energy such as wind and solar, with no CO2 emissions during production?

Green (renewable) hydrogen

What color of hydrogen is produced from fossil fuels by steam reforming or coal gasification without carbon capture, emitting 10 to 19 tons of CO2 per ton of H2?

Grey hydrogen

What color of hydrogen is produced from plastic waste using emerging processes such as pyrolysis, microwave catalysis and photo-reforming?

Orange hydrogen

What color of hydrogen is produced by water electrolysis powered by nuclear electricity, a clean but non-renewable source?

Pink hydrogen

What color of hydrogen is produced by water electrolysis using both nuclear power and nuclear heat?

Purple hydrogen

What color of hydrogen is produced by high-temperature catalytic splitting of water using heat and steam from nuclear plants?

Red hydrogen

What color of hydrogen is produced by methane pyrolysis, which breaks natural gas down into hydrogen and solid carbon at high temperature?

Turquoise hydrogen

What color of hydrogen is the green hydrogen produced specifically from solar energy?

Yellow hydrogen

What color of hydrogen is naturally generated in the Earth's crust when water reacts with iron-rich minerals at high temperature and pressure?

White hydrogen