2)Type in your message with the following format:
<c +color hex code+>what you want to say</c>
for eg: In the chat:- <cff0000>This is red text</c>
Clash Royale Text Color Hex Codes
Here are a few popular color hex codes. For a complete list, see:
Light Pink - ffcce7
Red - ff0000
Teal - 008080
Bright Blue - 0000ff
Turquoise - 00ffff
Coral - ff7373
Bright green - 00ff00
Purple - 800080
Yellow - ffff00
Light Blue - c6e2ff
Brown - #a52a2a
That's It Enjoy...
Source: