Many thanks for the reply Michel, it seems I was referencing the fonts incorrectly in type-enc ( fourier-mlb instead of futb8t). Alas, I'm still having some trouble as I cannot mix bold and non-bold fonts as per Hans' ThisWay doc. It all looks so simple on paper... I've added some extra 'bfmath' tags to what you sent so I have: in type-enc.tex \starttypescript [boldmath,bfmath] [fourier] [default,ec] \definefontsynonym [Fourier-Math-Letters-Bold] [futb8t] [encoding=ec] \definefontsynonym [Fourier-Math-Letters-Italic-Bold] [futmiib] \definefontsynonym [Fourier-Math-Symbols] [futsy] \definefontsynonym [Fourier-Math-Extension] [fourier-mex] \stoptypescript in type-sync.tex \starttypescript [boldmath] [fourier] [name] \definefontsynonym [MathRoman] [Fourier-Math-Letters-Bold] \definefontsynonym [MathItalic] [Fourier-Math-Letters-Italic-Bold] \definefontsynonym [MathSymbol] [Fourier-Math-Symbols] \definefontsynonym [MathExtension] [Fourier-Math-Extension] \stoptypescript \starttypescript [bfmath] [fourier] [name] \definefontsynonym [MathRoman] [Fourier-Math-Letters-Bold] \definefontsynonym [MathItalic] [Fourier-Math-Letters-Italic-Bold] \definefontsynonym [MathSymbol] [Fourier-Math-Symbols] \definefontsynonym [MathExtension] [Fourier-Math-Extension] \stoptypescript I've included a quick test below. When I run it, I get all the fonts being bold and some Greek symbols are missing after the \bfm command. Any ideas? Cheers, Randall %%%% START: test.tex \definetypeface [mainface] [rm] [serif] [fourier] [default] \definetypeface [mainface] [tt] [mono] [fourier] [default] \definetypeface [mainface] [ss] [sans] [fourier] [default] \definetypeface [mainface] [mm] [math] [fourier] [default] \definetypeface [boldmath] [rm] [serif] [fourier] [default] \definetypeface [boldmath] [tt] [mono] [fourier] [default] \definetypeface [boldmath] [ss] [sans] [fourier] [default] \definetypeface [boldmath] [mm] [boldmath] [fourier] [default] \definetypeface [mainface] [mm] [bfmath] [fourier] [default] \definetypeface [boldmath] [mm] [bfmath] [fourier] [default] \setupformulas [method=bold] \setupbodyfont [mainface] \starttext \formula {1 \beta \Gamma = \bfm 1 \beta \Gamma x z} \formula[mainface]{1 \beta \Gamma = \bfm 1 \beta \Gamma x' z} \formula[boldmath]{1 \beta \Gamma = \bfm 1 \beta \Gamma x' z} \formula[mainface]{1 \beta \Gamma = {\bfm 1 \beta \Gamma x'}z} \formula[boldmath]{1 \beta \Gamma = {\bfm 1 \beta \Gamma x'} z} \stoptext