Color in-text citation using biblatex - fixing a minor glitch

Question

I wanted all in-text citations in a different color to make them stand out from the text. I used a solution provided by following link.
Color citation using biblatex : in-text + references (issue with postnote + bibliography) In particular, I used \AtEveryCite command. The closing parenthesis is also colored blue. However, the period mark when the references are at the end of a sentence should be black, but above commands makes them blue. Any way to fix this minor glitch? Thanks. Jay

MWE

\documentclass[a4paper, oneside, 12pt]{memoir}
\usepackage[backend=bibtex, %bibtex worked well
style=authoryear-comp, %nature for numbered style
sorting=nyt, % cite according to author's last name,year and title.
maxbibnames=3]{biblatex} 

\addbibresource{biblatex-examples.bib}
\usepackage[table,xcdraw,dvipsnames]{xcolor} % colouring of raws and also for R code grey background
\definecolor{bleu_cite}{RGB}{34,111,212} % pure blue: {0,0,128}, light blue:{80,135,208}
\usepackage[
colorlinks=true,        
allcolors = black,  
citecolor=bleu_cite,        
]{hyperref} 
\AtEveryCite{\color{bleu_cite}}

\begin{document}
     This is a borrowed fact \parencite{aristotle:physics}. 

\end{document}

Answer 1

By default biblatex scans ahead for punctuation after a citation to avoid double punctuation. This means that biblatex 'takes over' printing punctuation directly after the citation. You can turn off this feature with

autopunct=false

Then you can continue to use \AtEveryCite{\color{bleu_cite}}.

---

But you can also use the \DeclareCiteCommand approach from Color citation using biblatex : in-text + references (issue with postnote + bibliography). You will have to modify this for your style, though.

\newcommand{\mkbibparenscol}[1]{\textcolor{bleu_cite}{\mkbibparens{#1}}}

\DeclareCiteCommand{\cite}[\textcolor{bleu_cite}]
  {\usebibmacro{cite:init}%
   \usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite}}
  {}
  {\usebibmacro{postnote}}

\DeclareCiteCommand{\parencite}[\mkbibparenscol]
  {\usebibmacro{cite:init}%
   \usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite}}
  {}
  {\usebibmacro{postnote}}