Hydrogen is often categorized by colors meant to indicate its emissions, but experts said getting too hung up on color could hinder the production and adoption of hydrogen-powered equipment.

This process produces "green hydrogen," which results in no carbon emissions. Green and blue are two of the many colors used to classify hydrogen by its production method and emissions profile.

Green hydrogen has failed to meet cost and scalability expectations. White hydrogen—naturally occurring underground—is gaining traction as a cheaper, cleaner alternative. Despite the hype ...