Butter is primarily composed of fats, which are non-polar molecules. Therefore, non-polar solvents are best at dissolving butter. Here are some examples:

* Oils: Vegetable oils like sunflower oil, olive oil, or canola oil are excellent at dissolving butter.

* Shortening: Shortening, which is essentially hydrogenated vegetable oil, is also effective.

* Acetone: Acetone is a common organic solvent used in many applications, but it is highly flammable and should be handled with caution.

* Ether: Diethyl ether is another organic solvent that can dissolve butter, but it is also volatile and flammable.

Important Note: While these solvents will dissolve butter, it's essential to consider the purpose and safety of using them.

* Cooking: Using oils or shortening is a common way to dissolve butter for cooking purposes.

* Scientific Research: Acetone and ether are typically used in labs for specific scientific experiments.

Water is a polar solvent and will not dissolve butter. You may see butter "melting" in water, but this is due to the fats becoming liquid, not dissolving.

If you are unsure about using any of these solvents, it's always best to consult a chemist or a relevant resource for safety information.