Can anyone tell me which tip is used to pipe the white flower?? I can’t seem to figure this one out.

The white flower is not a tip, it is mini marshmallows cut in half at an angle.

Really? Looks too perfect for cut marshmallows 

and although it comes out with a thinner petal the tip that could pipe a similar flower is a 81-- comes in different sizes

and you gotta pinch the tip of each petal you pipe to get the point -- the flower in this link is what happens if you don't pinch the tip 

https://www.wilton.com/chrysanthemum-mum/WLTECH-107.html

They aren't piped, they are made from miniature marshmallows.

https://www.google.com/search?client=safari&rls=en&q=marshmallow+flowers+tutorial&ie=UTF-8&oe=UTF-8#kpvalbx=0

I contacted the original poster when I saw it on Facebook, they're mini marshmallows.

they are so full and outlined around the edges — magnificent edible flowers — brilliant — wonder how they take color

Kate, check out the video that I posted.  They are colored.

They take airbrush really well,  but I personally love the colored sugar. It gives them a little something special lol