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निरंजन
I am using tcolorbox with option most. Optional parameter fontupper doesn't retain one xcolor setting over the pages. Interestingly it does retain \itshape. Is this a bug, or my mistake?


\documentclass{article}
\usepackage[most]{tcolorbox}
\usepackage{lipsum}

\begin{document}
\begin{tcolorbox}[fontupper=\itshape\color{red},breakable,enhanced]
\lipsum
\end{tcolorbox}
\end{document}


![Screenshot-73.png](/image?hash=50cacee375aff47f731713788898ee1b3e10952db3cf8588057be7b46dd45b6d)
Top Answer
user 3.14159
samcarter already explained in [her answer](https://topanswers.xyz/tex?q=1284#a1518) that this is a known limitation. However, to the best of my knowledge one is not supposed to use these \color commands in tcolorbox (nor tikz) anyway (unless you start to hack things, or in certain decorations), there are pgf keys for that. In this case there is the colupper key, which you can use. (This works also with pdflatex.)

\documentclass{article}
\usepackage[most]{tcolorbox}
\usepackage{lipsum}

\begin{document}
\begin{tcolorbox}[fontupper=\itshape,colupper=red,breakable,enhanced]
\lipsum
\end{tcolorbox}
\end{document}

![Screen Shot 2020-09-01 at 1.52.14 AM.png](/image?hash=23ef1f8c6037a24afd93c82330a9d8c70159a56c5c3f0cd87a6d26516cb1e5ca)
Answer #2
samcarter
That's a know limitation of tcolorbox mentioned in section "18.2 Limitations and Known Bugs" of the documentation

> If your text content contains some text color changing commands, your color will not survive the break to the next box. But, with the fontspec package and xelatex or lualatex, you can use \addfontfeatures{Color=mycolor} to add a font color which survives the break.

However with xelatex or lualatex, you can use the mentioned workaround:


% !TeX TS-program = lualatex

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Latin Modern Roman}
\usepackage{lipsum}
\usepackage[most]{tcolorbox}

\begin{document}

\begin{tcolorbox}[fontupper=\itshape\addfontfeatures{Color=red},breakable,enhanced]
\lipsum
\end{tcolorbox}
\end{document}


![Screen Shot 2020-09-01 at 10.37.15.png](/image?hash=2be96aa5bfb86ee6ad5868d3f1601e95c4595d0c33f8a2ed9d86e2d3ef5facc2)


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