Text Opacity (Alpha)
Important
This package is deprecated. From Unity 2023.2, TextMesh Pro is part of the Unity UI (uGUI) package. For current documentation, refer to TextMesh Pro in the Unity UI package.
Use the <alpha> tag to change text opacity. It works with hexadecimal values.
Example:
<alpha=#FF>FF <alpha=#CC>CC <alpha=#AA>AA <alpha=#88>88 <alpha=#66>66 <alpha=#44>44 <alpha=#22>22 <alpha=#00>00

Successive <alpha> tags