I’ve (we’ve) used a red (Nulon?) coolant (50:50) mix from SuperCheap whenever it needed topping up (never), or whenever preventative maintenance required (cambelt/water pump/thermostat).
Pretty sure it’s red, it’s not blue or green that said, I’m colour blind and once bought a black 156 Sportwagon in the dark that turned out to be charcoal grey (and much nicer).
Paraflu is just a brand, it’s the specifications that matter. Tech spec says Red
Red protective with antifreeze action, based on inhibited monoethylene glycol with organic formula. Exceeding CUNA NC 956-16, ASTM D 3306 specifications.