Pond dyeing
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Dyeing (adding pigmentation) to bodies of water such a ponds, lakes, or rivers can be done for the purposes of water management, but sometimes also cultural reasons.
Uses for dyeing water[edit]
Algae growth management[edit]
When applied to a garden pond or fishery lake, a darkening dye can be used to restrict the availability of ultraviolet light for algae, which inhibits undesirable growth that may kill other life in the pond if allowed to get out of control.
The chemical composition of the dye is not always advertised, but are claimed to be food safe and not affecting wildlife. Patents describing the product, as well as some manufacturers disclose using Acid Blue 9,[1][2] which can be added to foods to achieve a blue colour, for example ice cream and some liqueurs. Peer-reviewed research addressing the effects of pond dyeing is limited, but one study found that mosquitoes are attracted to dyed ponds.[3]
Some alternative strategies for restricting light in bodies of water include the use of shade balls in reservoirs.
Cultural[edit]
Dyeing of rivers is a tradition closely associated with St Patrick's day celebrations in the US, particularly the dyeing of the Chicago river, which has been temporarily dyed green annually since 1962.
Dyeing rivers and pools have also been used as a form of protest or publicity stunt, including one instance of the Limmat being dyed green by Extinction Rebellion,[4] and a pond in Vilnius being dyed blood red in protest of the Russo-Ukrainian War.[5]
References[edit]
- ↑ "About EcoLow Pond & Lake Dye". ecoloxdyes.com. Retrieved 2023-04-29.
EcoLox Blue Pond & Lake Dye is similar to other industry leading pond and lake dyes, in that it is a very safe and nontoxic, Acid Blue 9 based, aquatic colorant that adds a rich aqua-blue color to the water.
- ↑ China Active CN106566283A, 陈可学, "Coloring water-treatment agent", published 2018-01-12, issued 2018-01-12
- ↑ Ortiz-Perea, Natali; Gander, Rebecca; Abbey, Olver; Callaghan, Amanda (2018-03-28). "The effect of pond dyes on oviposition and survival in wild UK Culex mosquitoes". PLOS ONE. 13 (3): e0193847. Bibcode:2018PLoSO..1393847O. doi:10.1371/journal.pone.0193847. PMC 5873999. PMID 29590133.
- ↑ Wood, Vincent (2019-09-11). "Zurich river dyed luminous green by Extinction Rebellion activists". The Independent. Retrieved 2023-04-29.
- ↑ "Pond near Russian embassy in Vilnius dyed blood red in protest at war in Ukraine". The Baltic Times. 2022-04-06. Retrieved 2023-04-29.
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