Hi, thanks for the fast reply Mojca! Unfortunately it is still not working. Here is what I did. I'm afraid it has possibly more to do with pretty printers in particular (than lua scripts in general), but actually I have no idea. I took the file MyConTeXtDir/tex/texmf-context/tex/context/base/pret-lua.lua and copied it to MyConTeXtDir/tex/texmf-local/tex/context/user/pret-pas.lua Next I replaced every occurance of "lua" in this new file by "pas" (so this changed the name of one function and renamed the visualizer itself). Then I ran "context --generate". My testfile is added below. The "end" is typeset as if pret-pas.lua wouldn't exist. If I change "option=PAS" to "option=LUA" it works as intended ("end" is green). What is going on here? Any help is appreciated. \installprettytype[PAS][PAS] \setupcolors[state=start] \setuptyping[option=color] \definetyping[PAS][option=PAS, escape=yes, tab=4, numbering=line] \starttext \startPAS end \stopPAS \stoptext Thanks in advance, Stefan. PS: Additional question: Is it possible to integrate "option=color" into the "\definetyping[PAS]"? option={PAS,color}?