# color/fade
Multiply a color's alpha by `factor` (0-1, default 0.5). RGB is unchanged;
a fully transparent result stays transparent.
## Syntax
[color/fade $color $factor]
## Examples
[color/fade "#ff0000" 0.5] # "#ff000080" — half transparent [color/fade "#ff000080"] # "#ff000040" — half of the existing alpha
## Returns
`"#rrggbb"` hex string, or `"#rrggbbaa"` when translucent. nil when the
color is unparseable.
## See Also
`color/alpha`