---
title: b4
framework: swiftui
role: symbol
role_heading: Instance Property
path: swiftui/colormatrix/b4
---

# b4

## Declaration

```swift
var b4: Float
```

## See Also

### Fourth column

- [r4](swiftui/colormatrix/r4.md)
- [g4](swiftui/colormatrix/g4.md)
- [a4](swiftui/colormatrix/a4.md)