Why your colour is fading (and 5 quick fixes)

1. Hot water. Easily the biggest culprit. Switch to lukewarm, finish cold.
2. Sulfate shampoos. Strip colour fast. Sulfate-free is non-negotiable for coloured hair.
3. Daily washing. Three washes a week max for coloured hair.
4. UV exposure. Especially red and copper tones. Use UV-protectant leave-ins in summer.
5. Chlorine and hard water. Soak hair in tap water before swimming, use a clarifying mask once a fortnight if you're on bore/tank water.

If you fix the top two, you'll see a noticeable difference within a wash cycle.