The most common type of acid used in explosives is nitric acid (HNO3). Nitric acid is a strong oxidising acid that is highly corrosive and can react violently with a wide range of materials. It is used in the production of nitrocellulose, which is a key component of many explosives. Nitric acid is also used in the production of other explosives such as nitroglycerin and TNT.

Other acids that can be used in explosives include:

* Sulfuric acid (H2SO4)

* Hydrochloric acid (HCl)

* Perchloric acid (HClO4)

These acids are all strong oxidising acids that can react violently with a wide range of materials. They are used in the production of explosives because they can provide the necessary energy to cause an explosion.