There's an entire spectrum of hydrogen "colors" - https://hydrogen-central.com/cummins-hydrogen-rainbow-colors/ https://hydrogen-central.com/cummins-hydrogen-ra

There's an entire spectrum of hydrogen "colors" - https://hydrogen-central.com/cummins-hydrogen-rainbow-colors/ https://hydrogen-central.com/cummins-hydrogen-rainbow-colors... and https://rail.ricardo.com/news/opinion-decoding-the-hydrogen-t-rainbow https://rail.ricardo.com/news/opinion-decoding-the-hydrogen-... Getting hydrogen from water is one of: red or purple (nuclear - depending on process), yellow (solar), green (other renewables).