hhline vertical line color changes

Question

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}

Answer 1

The >{\arrayrulecolor{<color>}} can be used before vline tabular preambles like |.

In the following example, I set all three vlines in yellow.

\documentclass{book}
\usepackage{colortbl}
\usepackage{hhline}

\begin{document}
\setlength{\arrayrulewidth}{2pt} % to highlight array rules

\begin{tabular}{|c|c|}
  \hline
  a & b \\ \hline
  c & d \\ 
    % set all three vlines in yellow
    \hhline{
      >{\arrayrulecolor{yellow}} | 
      >{\arrayrulecolor{red}}    =
      >{\arrayrulecolor{yellow}} |
      >{\arrayrulecolor{cyan}}   =
      >{\arrayrulecolor{yellow}} |
      >{\arrayrulecolor{black}}
    }
  e & f \\ \hline
\end{tabular}
\end{document}