Yes it will unfortunately. You have a couple of options;
You can put a minus violet filter between the camera and the barlow
You can buy a good quality ED Barlow
You can buy a Powermate
A quick question. What are you hoping to shoot with your oneshot colour ccd camera? If you are hunting planets then a webcam?LPI (which I see you have) would be a better option. If you are hunting DSOs then adding a barlow/powermate will increase your f/ratio by the factor of the barlow. eg for 2 x barlow f7.5 becomes f15. That might seem like a good thing except it will increase you exposure time by a factor of 4
. 2.5x powermate will increase it by a factor of 6.25 etc.