The Sedgwick County Zoo in Wichita, Kan., will no longer be selling blue sno-cones after a dangerous mix-up at the refreshment stand, Fox4KC reported.
Four people became sick Thursday when a zoo employee accidentally poured a degreasing agent into the sno-cone machine instead of the flavored syrup.
The two bottles are the same size, shape and color and were accidentally placed next to each other.
A zoo spokeswoman said the employee didn't read the labels and apologized to families who got sick.
None of the victims ingested enough of the chemical for it to be dangerous.