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<div>Not sure if this will help. I wasn't aware that eplain could (or should?) be used with LaTeX. At any rate,</div>
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<div>\input colordvi</div>
<div>\Red{abc}, \Blue{def}, $\ldots$</div>
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<div>works with plain and eplain. I'm not sure whether eplain is needed. colordvi.tex belongs to dvips. You can use dvipdfmx to make pdf.</div>
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<div>Laurence</div>
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<div style="margin: 0 0 10.0px 0;"><b>Gesendet:</b> Montag, 13. Juni 2022 um 11:58 Uhr<br/>
<b>Von:</b> "Gérald Tenenbaum" <gerald.ten@free.fr><br/>
<b>An:</b> tex-eplain@tug.org<br/>
<b>Betreff:</b> [tex-eplain] colors</div>
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<div style="font-family: Lucida Sans;">Hello,<br/>
<br/>
Here is a small file that used to work but doesn't anymore:<br/>
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\input eplain<br/>
\beginpackages<br/>
\usepackage{color}<br/>
\endpackages<br/>
\long\def\red#1{{\color{red}#1}}<br/>
\red{ab}<br/>
\bye<br/>
<br/>
<br/>
The error message is:<br/>
<br/>
This is pdfTeX, Version 3.141592653-2.6-1.40.24 (TeX Live 2022) (preloaded format=pdftex)<br/>
restricted \write18 enabled.<br/>
entering extended mode<br/>
(./essai.tex (/usr/local/texlive/2022/texmf-dist/tex/eplain/eplain.tex)<br/>
(/usr/local/texlive/2022/texmf-dist/tex/plain/graphics-pln/miniltx.tex)<br/>
(/usr/local/texlive/2022/texmf-dist/tex/latex/graphics/color.sty<br/>
(/usr/local/texlive/2022/texmf-dist/tex/latex/graphics-cfg/color.cfg)<br/>
(/usr/local/texlive/2022/texmf-dist/tex/latex/graphics-def/pdftex.def)<br/>
(/usr/local/texlive/2022/texmf-dist/tex/latex/graphics/mathcolor.ltx<br/>
/usr/local/texlive/2022/texmf-dist/tex/latex/graphics/mathcolor.ltx:21: Undefined control sequence.<br/>
l.21 \ExplSyntaxOn<br/>
<br/>
Many thanks for help.<br/>
Regards,<br/>
<br/>
Gérald</div>
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