Krypton is not a metal, so therefore, it is not shiny or dull. It is a noble gas, and it's colorless and odorless.
i think that it is dull
By there shape, most of them have a shiny look to them, however some are dull.
That is the property of "luster".
It depends if the silver is metallic (shiny) or matte (dull). Metallic silver would reflect more heat than white, but matte silver would reflect less heat than white.
Most car radiators are black as black radiates heat more efficiently than any other color.
Neither, it is a colorless, odorless, tasteless gas.
The opposite of shiny is matte or dull.
How you would make a door shiny when it is dull depends on the material. For instance, you can make a house door shiny by putting epoxy on it.
dull
shiny
It is shiny.
Shiny
dull
Argon is a colorless, odorless, and tasteless gas at room temperature and pressure. It is not inherently shiny or dull because it is a gas, but when condensed into a liquid or solid form, it would not exhibit a shiny appearance.
Dull?
High purity must be shiny, but if oxidized it will become dull
It could be dull or shiny. It doesn't matter.