Zeoy grinned. "Trust me sweetheart. This'll be worth it." With practiced tan hands, the feruchemist grabbed a glass from the shelves behind the bar and twirled it between her fingers, turning around and setting it on the back counter. She opened a large cabinet on the wall and ran her purple eyes across the unlabled bottles. "Let's see... no... no... Aha!" she exclaimed triumphantly. Zeoy selected a tall and thin glass with yellow liquid inside, along with a second, opaque bottle. After pouring a good bit of the yellow stuff into a small container, along with just two drops of the black liquid inside the second bottle, she put a lid on the container and shook it vigorously. When she opening it, the substance had turned green. "That's the stuff!" The bartender grabbed the original glass and the gasoline from the front counter. "Might wanna stand back, this part gets a bit... eh, well, you'll see."
Zeoy filled the glass halfway with gasoline, then took out a welding mask from beneath the counter and put it on, chuckling to herself a little bit. She leaned down so that the glass was at eye-level, then poured the green liquid she'd made carefully into the glass. Nothing happened.
At first.
A flame a foot high rose up from the glass, then settled down quite quickly. Once that was done, little sparks zapped from the now blue drink. Zeoy took off the welding mask, grinning. "Now that's a drink."