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| Rusting Acid |  
| Component |  | 
| This rusting acid is especially corrosive against metal objects. | 
| Required crafting skills: Chemistry 80
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| Use: Throw the vial at the target, bypassing its energy shield and dealing 50-100 acid damage if it lands, and also applying 3 stacks of Rusting debuff which reduces durability of all mechanical items in taget's possesion by 2 per stack each turn for 10 turns, Stacks 10 times. Acid damage is increased by 35% against vehicles and machines. (AP:25)
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| Weight: 0.35 | 
| Value: 160 | 
 Rusting Acid is a chemical extracted from Rusting Acid Glands. It is also sold as special merchandise by Katya.
It is additionally a throwable Utility. 
Used in
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| Components |  
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| Includes all components from Underrail base game, and the Underrail: Expedition and Underrail: Heavy Duty expansions. |  
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| Firearm parts |  |  
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| Crossbow parts |  |  
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| Other weapon parts |  |  
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| Vests & padding |  |  
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| Ballistic panels & plates |  |  
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| Other armor parts |  |  
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| Metal components |  |  
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| Fabrics & leathers |  |  
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| Psionic components |  |  
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| Electronic parts |  |  
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| Chemicals |  |  
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| Animals & organs |  |  
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| Plants & fungi |  |  
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| Medical & containers |  |  
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| Scrap & others |  |  | 
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| Weapons |  
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| Firearms |  |   |  
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| Other guns |  |  
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| Throwing |  |  
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| Crossbows |  |  
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| Melee |  |  
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| Traps |  |  
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| Unique guns |  |  
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| Unique other |  |  
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| Sørmirbæren E |  |  | 
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| Combat utilities |  
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| Special bolts |  |   |  
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| Throwing | Caltrops (Burrower , Cave Ear , Crawler , Blinding E , Leper E ) • Throwing Knife  (Black Dragon , Burrower , Cave Ear , Crawler , Spirit , Blinding E , Leper E , Heartbreak E ) • Shock Shurikens  • Throwing Net  • Acid  • Corrosive Acid  • Rusting Acid |  
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| Standard grenades |  |  
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| Special grenades |  |  
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| Other utilities |  |  |