---
title: colorEvolutionPower
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/particleemittercomponent/particleemitter/colorevolutionpower
---

# colorEvolutionPower

How quickly the color evolves from its start to its end color — a value of 1 is a linear transition, values below 1 transition quicker, values over 1 transition slower.

## Declaration

```swift
var colorEvolutionPower: Float
```