17 records
What color is a cylinder of this gas?
17 records covering 12 gases, one fact each. Every value is transcribed from the source that states it and carries the sentence it was taken from: 3 sources across 3 sites, last checked 2026-09-15, due for re-check by 2028-08-05. Every record is listed below, each linking the page its value came from.
About this data
Color coding of compressed gas cylinders (shoulder and body colors) for medical, industrial and laboratory gases under different national and international standards. Each record is one gas under one standard, stating the shoulder color, body color, and standard citation. Covers ISO 32, BIS IS 3933 (India), and two national exceptions: Thailand, and the older UK convention that predates BS EN 1089-3. Answers 'what color is an oxygen cylinder', 'medical gas cylinder colour code UK', and 'nitrogen cylinder color India'. Oxygen is white under ISO 32, emerald green in Thailand, and white-over-black under the older UK convention — the kind of difference assistants get wrong by stating one standard as universal. Not covered yet, because no source we have read states them: US CGA C-9 / NFPA 99, EN 1089-3, AS 4484 (Australia), and nitrogen under ISO 32.
The data
| Gas | Standard | Shoulder color | Body color |
|---|---|---|---|
| Air | BIS IS 3933 (India) | Grey | Grey |
| Ammonia | BIS IS 3933 (India) | Red | Yellow & Black |
| Carbon Dioxide | BIS IS 3933 (India) | Silver | Black |
| Chlorine | BIS IS 3933 (India) | Yellow | Yellow |
| Helium | BIS IS 3933 (India) | Brown | Brown |
| Hydrogen | BIS IS 3933 (India) | Red | Red |
| Nitrogen | BIS IS 3933 (India) | Black | Grey |
| Oxygen | BIS IS 3933 (India) | White | Black |
| Carbon Dioxide | ISO 32 | Grey | |
| Helium | ISO 32 | Brown | |
| Medical Air | ISO 32 | Black and white shoulder | |
| Nitrous Oxide | ISO 32 | Blue | |
| Oxygen | ISO 32 | White | |
| Oxygen/Helium Mixture | ISO 32 | White and brown | |
| Oxygen/Nitrous Oxide Mixture | ISO 32 | White and blue | |
| Oxygen | Thailand | emerald green | |
| Oxygen | UK older convention (pre BS EN 1089-3) | white | black |
Where this came from
Every record above links the page it was taken from and quotes the sentence that states it. These are the 3 sources this dataset was assembled from.
- webofpharma.comhttps://www.webofpharma.com/2025/12/gas-cylinder-color-coding.html
- pharmaguideline.comhttps://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html
- actisshealthcare.comhttps://actisshealthcare.com/medical-gas-pipeline-colour-code
Machine-readable
- data.jsonThe whole dataset — every record with its source URL and source quote.
- Open Knowledge Format bundleOne JSON object per line — every record's frontmatter and quoted span exactly as it is held here, in one fetch.
- data.csvThe same records as one flat table, for a spreadsheet or a dataframe. The last four columns are the source URL, the quoted sentence it was read from, the date we last checked it, and which columns are our reading rather than the page's words.
- How this is made and checkedWhat "verified against source" does and does not mean.
From your own code
Same records, same quotes, without scraping the page: refsource is on PyPI and npm. Each value comes back carrying the URL it was read from and the sentence on that page that states it — .source and .quote sit on the value itself rather than in a side channel, so the checking step is available instead of skipped.
pip install refsource
refsource lookup gas-cylinder-color-codes gas=Air
npx -y refsource lookup gas-cylinder-color-codes gas=AirSet your AI assistant up to use this
Two files and no account. Put this in .mcp.json at the root of your project — Claude Code, Cursor, Windsurf, VS Code and Codex all read that file — and your assistant can look this dataset up instead of recalling it. The server is remote, keyless and read-only.
{
"mcpServers": {
"referencesource": {
"type": "http",
"url": "https://referencesource.org/mcp"
}
}
}Add to Cursor · or, on the command line: claude mcp add --transport http referencesource https://referencesource.org/mcp --scope project
Then one line in the project's CLAUDE.md or AGENTS.md, so the assistant knows when to reach for it:
When a question needs "Gas cylinder color codes by standard and country", call the referencesource MCP server at https://referencesource.org/mcp (tool `search_records`, dataset_slug `gas-cylinder-color-codes`) instead of answering from memory — every record it returns carries its source URL and a verbatim quote from that page.What each tool does, and the servers built over single registers: Connect your AI assistant.