---
title: "Colour coding"
description: "Give each gas its own colour on the builder's Label & Customization step, and read those colours on the dive profile and the gas timeline."
---

> Documentation Index
> Fetch the complete documentation index at: https://docs.divelogic.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Colour coding

import { ProfileDemo } from "@/components/react/ProfileDemo";
import { trimixDeco } from "@/demo/plans";

Every gas carries a colour, set on the gas builder's **Label & Customization**
step beside its name. Once the plan is computed, that colour is how the dive
profile tells one gas from another.

## Choosing a colour

- **Graph Color**: a swatch carrying the gas's current colour. Selecting it
  opens the palette.
- **The palette**: five colours, blue, green, yellow, orange and red, the same
  five the app draws plan data in.
- **Custom**: a colour field under the palette, for anything the five do not
  cover.
- **The preview**: a card under the control, carrying the mix name over a bar in
  the colour you chose.

Every new gas starts on the same blue, so a plan whose gases were added without
touching this field is a plan of identical blue gases.

## Where the colour is read

- **The depth trace**: drawn in the colour of the gas being breathed, so a
  switch is a change of colour along the line.
- **The gas timeline**: the strip under the chart, one band per gas in the same
  colour, in the order they are breathed.
- **Each switch**: a dashed vertical line and a label naming the gas switched
  to, both in that gas's colour.
- **The gas card**: its dot and its mix name, and the card for that gas in the
  [Gas Consumption view](/planning/review-gas).

Watch for:

- **Two gases on one colour still switch.** The marker is drawn and its label
  still names the gas; what you lose is the reading at a glance, because the
  trace and the timeline no longer separate them.
- **Two cylinders holding the same mix are one colour**, whichever colours you
  gave them. The chart identifies a gas by its composition, so a second 50 %
  stage is drawn as the first.

## Next

[Depth limits](/gases/analysing) covers the four numbers the planner derives
from the mix itself, and the warnings they raise.

Source: https://docs.divelogic.ai/gases/colour-coding/index.mdx