IV–C–13

These tube are used to detect chlorpicrin, cyanogen chloride, and phosgene oxime.

This tube has 2 green bands and may have the letter "f" stamped on the end containing the 2 capsules.

These tubes are slightly different from the others in that the older model has a single capsule loose in a 0.8 inch section closed with a plastic cap which has a small square hole. The newer model with the marking "f" differs from the single yellow newer model in that one of the 2 capsules is filled with a white powder instead of the usual brown liquid, and there is no separating disc between the two capsules.

The tube are packed in tens in grayish-green painted metal containers measuring 2.5 x 4.7 x 0.5 inches. The slip-on cover has 2 green bands lenghtwise across the outside.

IV–C–13