code/modules/reagents/chem_splash.dm 
| /proc/chem_splash | The basic chemical bomb proc. Combines a set of reagent holders into one holder and reacts it. If there are any reagents left over it spreads them across the surrounding environment. The maximum volume of the holder is temporarily adjusted to allow for reactions which increase total volume to work at full effectiveness. The maximum volume of the holder is then reset to its original value. |
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| /proc/spread_reagents | Exposes all accessible atoms within some distance of an epicenter to some reagents. Does not clear the source reagent holder; that must be done manually if it is desired. |