Color may vary depending upon your base color. The lighter you hair the more vibrant the color. You can achieve vibrancy on dark hair if you apply at least two layers of color. Depending on the length/thickness of your hair if you are looking to achieve highlights one regular size container is fine, if looking to achieve an all over color look we would recommend at least two regular size containers or the larger 4oz container. Please allow 2-4 business days processing.