Hello Julie,
I can give you some insight to the description, the 1 Hour results would be similar to 6% regular
solution , where as waiting the full four hour period would give maximum results of similar to 9% or 10.5%.
As with all "RAPID" products offered by other companies, all result descriptions will show full results in four hours, not one. For those who have light skin, it is possible to reach desired color in an hour, however those who want to be the maximum strength, will need to wait longer. Everyone is different, so times will differ as well.
We are offering booster dha for free if there is any worry about the depth of color. You can call to inquire for the free DHA boost to be added to all ultra orders.
Thank you,