Font styles for pptx report title/subtitle

I want to change the font color of my title on the first title slide of a report powerpoint... I tried it with FontColor but got an error.... Anybody have a solution?

slides = 'test1.pptx';
ppt = Presentation(slides);

slide1 = add(slides,'Title Slide');
title = 'testing trial first'
replace(slide1, 'Title', title);
title.Style = {FontColor('red')};  % error: unable to perform assignment because dot indexing is not supported for variables of this type

close(ppt);
reptview(ppt);