Last week there was word about paraffin / Nytrox. This "hybrid" is recommended for Virgin Galactic "suborbital". So, for rocketing stuff off of Earth, first-stage.
As to how P/N compares with hydrazine, or those green salts - this hybrid will burn in one-bar atmo or less. They are, I think, talking lower impulse by higher thrust: they just need to get stuff off the ground.
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