Colour arrows graphdrawing

Question

I am using graphdrawing tikz to create a small tree. In the MWE below, I would like to have a blue arrow pointing to B1 and an orange arrow pointing to B2. How could I do this?
documentclass[tikz,border=10pt]{standalone}

usetikzlibrary{graphdrawing}
usetikzlibrary{graphs}
usegdlibrary{trees}

newcommand{eg}{textit{e.g., }}

begin{document}
begin{tikzpicture}[>=stealth, every node/.style={minimum size=0.75cm}]
graph [tree layout, grow=down, fresh nodes, level distance=0.5in, sibling distance=0.5in]
    {
        Model -> {
            "A1" ->[very thick, blue] {B1 -> {C, D}, B2},
            A2 -> {C}
        } 
    };
end{tikzpicture}
end{document}

muzimuzhi Z · Accepted Answer

You can use B2[>orange] to (specially) specify the incoming edge (the arrow) of B2 in orange. See pgfmanual 3.1.6a, sec. 19.6.4 Special Syntax for Options For Incoming and Outgoing Edges.
documentclass[tikz,border=10pt]{standalone}

usetikzlibrary{graphdrawing}
usetikzlibrary{graphs}
usegdlibrary{trees}

newcommand{eg}{textit{e.g., }}

begin{document}
begin{tikzpicture}[>=stealth, every node/.style={minimum size=0.75cm}]
graph [tree layout, grow=down, fresh nodes, level distance=0.5in, sibling distance=0.5in]
    {
        Model -> {
            "A1" ->[very thick, blue] {B1 -> {C, D}, B2[>orange]},
            A2 -> {C}
        } 
    };
end{tikzpicture}
end{document}

Colour arrows graphdrawing

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