How to change highlighted portion of vertical line black or different color of each vertical line in the cell using hhline? Please find MWE file:
\documentclass{book}
\usepackage{colortbl}
\usepackage{array}
\usepackage{hhline}
\usepackage{ragged2e}
\usepackage[draft]{hyperref}
\usepackage{tabu}
\newcolumntype{L}[1]{>{\RaggedRight\arraybackslash\hspace{0pt}}p{#1}}%\hangindent6pt
\begin{document}
\begin{tabu}{|L{50pt}|L{50pt}|L{50pt}|L{50pt}|L{50pt}|L{50pt}|}
Sample 1 &Sample 2 &Sample 3 &Sample 4 &Sample 5&Sample 6\\
Sample 1 &Sample 2 &Sample 3 &Sample 4 &Sample 5&Sample 6\\
Sample 1 &Sample 2 &Sample 3 &Sample 4 &Sample 5&Sample 6\\
Sample 1 &Sample 2 &Sample 3 &Sample 4 &Sample 5&Sample 6\\
\hhline{>{\arrayrulecolor{blue}}=>{\arrayrulecolor{red}}=>{\arrayrulecolor{yellow}}=>{\arrayrulecolor{green}}==>{\arrayrulecolor{red}}=}
Sample 1 &Sample 2 &Sample 3 &Sample 4 &Sample 5&Sample 6\\
%\hhline{|||||>{\arrayrulecolor{blue}}=|||||>{\arrayrulecolor{white}}|>{\arrayrulecolor{black}}|>{\arrayrulecolor{red}}=>{\arrayrulecolor{yellow}}=>{\arrayrulecolor{green}}===}
Sample 1 &Sample 2 &Sample 3 &Sample 4 &Sample 5&Sample 6\\
\hhline{|>{\arrayrulecolor{blue}}=|>{\arrayrulecolor{red}}=|>{\arrayrulecolor{blue}}=|>{\arrayrulecolor{red}}=|>{\arrayrulecolor{blue}}=|>{\arrayrulecolor{red}}=|}
Sample 1 &Sample 2 &Sample 3 &Sample 4 &Sample 5&Sample 6\\
%\hhline{>{\arrayrulecolor{black}}~~>{\arrayrulewidth3pt}=~~}
Sample 1 &Sample 2 &Sample 3 &Sample 4 &Sample 5&Sample 6\\
\end{tabu}
\end{document}