can i use tylo powder to make white butter cream ?

Tylose won't whiten buttercream.  Tylose is a gum that increases stretch and decreases drying time in fondant in gum paste.

To whiten buttercream you would use liquid or powdered white food color [titanium dioxide].  You can also use a dot of violet gel/paste color.  Well mixed, it will cancel out the yellow and leave the BC quite white.

thank you soo much