Step 1: Understanding the Concept:
Medical gas cylinders are color-coded to prevent the accidental administration of the wrong gas, which could be fatal.
Step 2: Detailed Explanation:
1. Standard Color Coding: According to international and Indian standards (IS 3933), medical gas cylinders have specific body and shoulder colors.
2. Oxygen: For medical grade oxygen, the cylinder typically has a black body with a white shoulder (top part). In many simplified contexts or questions, it is often identified by the White color associated with its identifying parts.
3. Other Gases: Nitrous oxide is Blue; Cyclopropane is Orange; Carbon dioxide is Grey.
Step 3: Final Answer:
Based on standard medical gas coding, White is the identifying color for oxygen-filled cylinders.