Colloids are contraindicated in 1st 24 hrs while crystalloids are considered main stay in 1st 24 hrs. Why? Guys please clear the concept

Colloids are contraindicated in 1st 24 hrs while crystalloids are considered main stay in 1st 24 hrs. Why?
Guys please clear the concept

Its coz during frst 24 hrs if trauma is serious we might give blood transfusion and colloids has citrate in it so it might cause transfusion reaction.