Yes, you're correct, they are a super hot pink rose standard. My mother always added a bit of Epsom salts to the base of her roses to get the leaves nice and dark...

According to the National Gardening Association:

Many rosarians agree that Epsom
salts-treated planats produce more new canes at the bottom of the plant
(bottom breaks) and darker green foliage. Recommendations on how much to
use vary, but generally you can apply 1/2 cup of granules in spring
before buds first begin to open and 1/2 cup in fall before leaves drop.
Apply a foliar spray (1 tablespoon per gallon of water per foot of shrub
height) after the leaves open in spring and again at flowering.