I have a BEAUTIFUL Isotherm Vacuum Flask for sale that I used to get close up pictures of the affects that liquid nitrogen has on things. Since this one is not silvered it's not nearly as efficient as if you used a fully silvered model but it does give you the clearest possible close up view and does slow down the evaporation process VERY well.
I love this thing, and I know you will too. The item "Isotherm 3 Liter Clear Transparent Vacuum Dewar Flask Liquid Nitrogen LN2" is in sale since Monday, May 24, 2021. This item is in the category "Business & Industrial\Healthcare, Lab & Dental\Medical, Lab & Dental Supplies\Glassware & Plasticware\Lab Flasks". The seller is "jmaasa" and is located in Pontiac, Illinois.
This item can be shipped to United States.