Hydrangea question... please help.?

My have a pink hydrangea plant that is doing very well. I live in Maryland by the way, its the month of June so it does get very hot. The other day I used some HollyTone to fertilize the plant. The color of my plants has since changed to very very light pink. I did not want that to happen. Is there anything I can do at this moment to bring the old color back. I have some Garden Lime, should I use that? Thanks guys.