Reagents (Equivalent Exchange)

You probably often see the message "Not enough reagents" when using alchemical tools such as the Philosopher's Stone, Destruction Catalyst, or Volcanite Amulet. You might be wondering what that means.
Reagents refer to the fuels that Power Items use to work their mag-- er, science. Reagents are required to use most alchemical tools, very few are exempt, and those that are usually only have low-scale effects. Reagents come in several flavors, from weakest to most powerful:
Redstone Dust (2)
Gunpowder (6)
Glowstone Dust (12)
Glowstone Blocks (48)
Mobius Fuel (54)
These numbers are based on the efficiency of the Destruction Catalyst. Other tools have different costs for their effects which are usually listed on their entries in the mod's forum post or on this wiki.
Depending on the tool you are using, you may need either ANY fuel (such as the Destruction Catalyst), or specific fuel(s) (Volcanite Amulet, most of the rings). Some items even use different types of fuel for different effects, since some are more powerful than others.
The following tools use any type of fuel:
Destruction Catalyst (destroys blocks equal to numbers above per 1 unit of fuel)
Catalytic Lens (twice the efficiency of the Destruction Catalyst!)
The special functions of Dark Matter tools (excluding the pick, which uses no fuel, and the sword, which uses specifically glowstone dust)
The following tools use specifically redstone dust:
Philosopher's Stone (wall-raising effect, only when charged)
Volcanite Amulet
Evertide Amulet (rain effect only)
Soul Stone
Ring of Ignition (G-toggle "aura of fire" only)
Swiftwolf's Rending Gale (mob knockback, flight, interdiction (barrier), rain to storm)
Harvest Goddess Band (G-toggle "aura of fertility" only)
The following tools use specifically glowstone dust:
Philosopher's Stone (mob transmutation effect)
Swiftwolf's Rending Gale (thunderbolt)
Watch of Flowing Time
Dark Matter Sword
The following tools use non-fuel reagents:
Philosopher's Stone (building materials for wall-raising effect)
Harvest Goddess Band (bonemeal for auto-fertilize, plants/seeds for auto-plant)
Archangel's Smite (dirt, cobble, gravel, flint, arrows for projectiles)