Can reused vegetable oil be stored at room temperature?

If you mean 6°C, this is not an ideal situation for a young, growing tortoise overnight, but you can bring it indoors overnight and keep it outside during the day...

This would work, although true ferrofluid is not just iron oxide and vegetable oil.

Absolutely, you can use corn oil instead of vegetable oil, there's not a huge difference, so it won't change the recipe.

Soapcalc.net will give you the complete recipe when you plug in these amounts.

You could, but depending on the specific type of oil you use, it may alter the taste and consistency slightly.

Hard wax is the only kind of wax that salons can re-use. Because hard wax must be applied in a thick layer and is typically applied at least twice in...

Heat up to 185-195F (or 85-90C). Cool down to about 105F (or about 40C). Letting it cool down appropriately is essential so the hot milk doesn't alter other ingredients.

Most fish can acclimate within their safe range. Temperature changes should be gradual, and as you're moving them, they'll have been through some change already. If your home temperature will...

Yes, you can use the whey for various things. You could use it when making bread, simply replace water with whey. You can also use it for starting new cheese...

Yes, vegetable oil is a good substitute.