Originally Posted by DBZ Wikia

10x Kamehameha - This name is given to the amplified, red-colored Chou Kamehameha used by Goku while in his Super Saiyan 4 form. Along with its incredible destructive power, the attack has a delayed effect if the inital blast fails, wherin the target will be blasted by residual effects left over by the beam. While not as devistating as the initial blast, the after-effect can catch opponents off guard.