Oxygen
Oxygen tanks often have white tops. White means oxygen inside, which is needed for work and health uses. Always check markings to confirm it’s oxygen.
Nitrogen
Nitrogen tanks usually have black tops. Black shows nitrogen inside, used for food storage and making electronics. Check markings match the color for right ID.
Carbon Dioxide
Carbon dioxide tanks mostly have gray tops. Gray means carbon dioxide, used in drinks and fire tools. Make sure markings say it’s carbon dioxide.
Argon
Argon tanks often have dark green tops. Green means argon inside, used for welding and lights. Always trust markings to know the right gas type.