Where to find

• Chemical storage, military lockers and tool chests at Chang-san Air Base
• Toolboxes and tool chests at industrial spots

How sure

In-game hint

Print it

After Uncommon Ingredient Printing

Upgrades

• Stash Weapon Upgrade I ×20
• Gunsmith Upgrade I ×20

40 in total for every upgrade above.

Notes

Also a DMZ level 11 reward. Game Rant calls it Reactive Materials; every other guide says Reactive Metals.

Item icons © Activision / Infinity Ward, sourced via GGRanked (ggranked.com).

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