Plastic toys often have a flash or seam resulting from excess plastic leaking out of the mold. Such a seam is clearly visible on the base of these toys.

Flash or flashing is excess material attached to a molded, forged, or cast product, which must usually be removed. This is typically caused by leakage of the material between the two surfaces of a mold. (This leak begins along what is called a parting line in mold design^[1]) Molding flash is seen when the optimized parameter on cull height is not calibrated.^{[citation needed]} Proper design of mold parting surfaces can reduce or eliminate flash.^[2]

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