Hi Linda,
I wanted to see what my attempt at making your signature transparent looked link on a yellow background. I think the reason you're seeing some white around the flowers is because the tube wasn't clean or completely transparent.
I tried to remove some of the white on this one. I didn't on the one I included in another thread but I'm going to copy your transparent tag along side my transparent tag to see if it made any difference.
This first one is the one I did...
And this is your transparent tag cropped....
I think this is your's uncropped....
Sheryl