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Jack-o-Lanterns look best for the first 48 hours after carving, and will then start to dry out, shrivel and get moldy.
To make it last longer, you can put petroleum jelly over the cut edges, and keep in a cool place like the refrigerator when not on display.

www.myscienceproject.org/pumpkin.html

How Do You Preserve a Jack O' Lantern? The Experiment ... We chose 6 carving pumpkins of approximately the same size, shape and weight (around 2.5 lbs). One method .... We tossed it and turned our attention to the last two survivors. ... Your pumpkin's life may not be as long overall, but it will look good while it lasts.

www.thekitchn.com/5-ways-to-make-your-halloween-pumpkin-last-longer-211180

Oct 24, 2016 ... Before you carve up a pumpkin masterpiece only to watch it wither away ... of your pumpkin and keep it looking fresh-from-the-patch for as long as possible. ... Bleach is dangerous and apple cider vinegar will only attract bugs.

www.wikihow.com/Maintain-a-Carved-Pumpkin

While you can't preserve your pumpkin forever, there are a few things you can do to make it last a little bit longer. This wikiHow will show you how to maintain a ...

www.quora.com/How-long-does-the-average-pumpkin-last-after-it-is-carved

When I moved to California I was horrified by how fast my carved pumpkins rotted . It turns out that being left outside at 70 F really encourages mold growth. I think it  ...

www.growingajeweledrose.com/2013/09/how-to-make-carved-pumpkins-last-longer.html

Do you want to carve those pumpkins early in October and not have them rot? Believe it or not this is possible! Here are 5 tips for preserving carved pumpkins for ...

answers.yahoo.com/question/index?qid=20061015160629AAR2lxi

Pumpkins can last several weeks once carved if the weather stays cold. If it get warm the pumpkin will mush eaier. Also it depends on wether or not ...

www.thoughtco.com/preserving-a-halloween-jack-o-lantern-607678

Sep 2, 2016 ... Your carved pumpkin or jack o lantern doesn't have to rot or mold before Halloween! See how to preserve a pumpkin so it will last weeks and ...

www.zmescience.com/other/feature-post/how-long-carved-pumpkins-last-and-how-you-can-make-it-last-more

Oct 23, 2015 ... But after putting all the work into carving that beautiful pumpkin, you don't really want to throw it away, so how long do these things last anyway ...

www.examiner.co.uk/news/west-yorkshire-news/how-long-carved-pumpkins-last-10305342

Oct 21, 2015 ... After it's been carved, rinse it out with water to get rid of the excess ... Click below to see some of the best pumpkin creations from last year!