Yes you can. We only recommend dying the virgin #1B color, they are completely natural and will take color easily from to 2 to 3 shades. If you need to go lighter then bleaching may be involved, in which case we would recommend you consult a professional. We do not recommend coloring hair that's already been colored.
When doing any color service to the hair, perform a test strand first to see how the color processes with your formula being used. Once you confirm the results and processing time are correct than you can carry on with the full application of color desired. Keep in mind that the lighter you go it may slightly loosen the hair's natural curl pattern. This is something you can check for after completing your strand test as well.
With proper care and maintenance, this overall product will last you at least 1 to 2 years with proper care. We have customers that have been using the same hair extensions upwards of 4 to 5 years. We recommend only using the highest quality hair extension products