\definecolor[colA] [r=0,g=0,b=0.01,t=0.2,a=1] % transparent
\definecolor[colB] [r=.278431,g=.235294,b=.545098] % opaque

\starttext 
  \startcolor[colA]
    \definedfont[SansBold at 96bp]Titanfall\,
    \startcolor[colB]2\stopcolor
  \stopcolor
\stoptext