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When the beeswax from brood comb is rendered to produce clean wax, it leaves behind the pupal lining, wax moth cocoons, excrement from larvae, and other residual debris included in the original material.
Less slumgum can be expected from rendering of cappings or honey comb. Slumgum is slightly heavier than wax and sticks to the bottom of the wax cake. It is brown to black in color, and burns readily. Melted slumgum can be poured over pine cones to make fire starters.
Lumps of slumgum are very attractive to bees, especially when heated by the sun. They can be used to attract bee swarms, and some people therefore prefer applying melted slumgum on the sides of supers.
Slumgum is also used as a fertilizer in some agricultural crops like ornamentals; it has been shown that slumgum contains several nutrients that are required for the growth of these crops.
Depending on how well the rendering was performed, slumgum may still contain significant amount of wax that is possible to extract in larger factories using more complex equipment.
- Morales-Corts, R.; Gómez-Sánchez, M. A.; Pérez-Sánchez, R.; Prieto-Calvo, C. (2010). "Characterization of bee keeping wastes for using in seedling production". Spanish Journal of Agricultural Research. 8 (2): 493–500. doi:10.5424/sjar/2010082-1216.
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