A rose I am no more

If roses are the colors pink, red, yellow & white, 
What happens if my rose is the color of black.
If all roses have their thorns, 
What happens if my rose has lost its thorns.
If a rose that has no color & no thorns is no longer a rose, 
Then a rose of color & thorns I am no more.
A rose I am no more, A rose I am no more.