How to set different colors for sliders in controlTemplate?

Question

XAML

<UserControl.Resources>

            <SolidColorBrush x:Key="ReadOnlyTextBrush" Color="#555555" />
        <ControlTemplate x:Key="simpleSlider" TargetType="{x:Type Slider}">
            <Border SnapsToDevicePixels="true" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="Auto" MinHeight="{TemplateBinding MinHeight}"/>
                        <RowDefinition Height="Auto"/>
                    </Grid.RowDefinitions>

                    <Rectangle x:Name="PART_SelectionRange"/>

                    <Track x:Name="PART_Track" Grid.Row="1">
                        <Track.Thumb>
                            <Thumb x:Name="Thumb">
                                <Thumb.Template>
                                    <ControlTemplate TargetType="Thumb">
                                        <Rectangle Fill="{StaticResource ReadOnlyTextBrush}" 
                                                   Stroke="Black"
                                                   StrokeThickness="1" 
                                                   Width="10"
                                                   Height="18"
                                                   SnapsToDevicePixels="True"/>
                                    </ControlTemplate>
                                </Thumb.Template>
                            </Thumb>
                        </Track.Thumb>
                    </Track>
                </Grid>
            </Border>
        </ControlTemplate>
    </UserControl.Resources>
    
    <Grid VerticalAlignment="Top">
        <Border BorderThickness="0,1,0,0" BorderBrush="Black" VerticalAlignment="Center" Height="1" 
                Margin="5,0,5,0"/>


        <Slider x:Name="Slider1"
                Minimum="{Binding ElementName=root, Path=Minimum}"
                Maximum="{Binding ElementName=root, Path=Maximum}"
                Value="{Binding ElementName=root, Path=Slider1Value, Mode=TwoWay}"
                Template="{StaticResource simpleSlider}"
                Margin="0,0,10,0"
                BorderBrush="Yellow"
                >
        </Slider>
        <Slider x:Name="Slider2"
                Minimum="{Binding ElementName=root, Path=Minimum}"
                Maximum="{Binding ElementName=root, Path=Maximum}"
                Template="{StaticResource simpleSlider}"
                Value="{Binding ElementName=root, Path=Slider2Value, Mode=TwoWay}"
                Margin="0,0,20,0"
                
                Foreground="Green"
                />

        <Slider x:Name="Slider3"
                Minimum="{Binding ElementName=root, Path=Minimum}"
                Maximum="{Binding ElementName=root, Path=Maximum}"
                Template="{StaticResource simpleSlider}"
                Value="{Binding ElementName=root, Path=Slider3Value, Mode=TwoWay}"
                Margin="0,0,30,0"
                
                Foreground="Red"
                />
        <Slider x:Name="Slider4"
                Minimum="{Binding ElementName=root, Path=Minimum}"
                Maximum="{Binding ElementName=root, Path=Maximum}"
                Template="{StaticResource simpleSlider}"
                Value="{Binding ElementName=root, Path=Slider4Value, Mode=TwoWay}"
                Margin="0,0,40,0"
                
                Foreground="Red"
                />
        <Slider x:Name="Slider5"
                Minimum="{Binding ElementName=root, Path=Minimum}"
                Maximum="{Binding ElementName=root, Path=Maximum}"
                Template="{StaticResource simpleSlider}"
                Value="{Binding ElementName=root, Path=Slider5Value, Mode=TwoWay}"
                Margin="0,0,50,0"
                />
        <Slider x:Name="Slider6"
                Minimum="{Binding ElementName=root, Path=Minimum}"
                Maximum="{Binding ElementName=root, Path=Maximum}"
                Template="{StaticResource simpleSlider}"
                Value="{Binding ElementName=root, Path=Slider6Value, Mode=TwoWay}"
                Margin="0,0,60,0"
                Foreground="Red"
                />
        <Slider x:Name="Slider7"
                Minimum="{Binding ElementName=root, Path=Minimum}"
                Maximum="{Binding ElementName=root, Path=Maximum}"
                Template="{StaticResource simpleSlider}"
                Value="{Binding ElementName=root, Path=Slider7Value, Mode=TwoWay}"
                Margin="0,0,70,0"
                Foreground="Red"
                />
        <Slider x:Name="Slider8"
                Minimum="{Binding ElementName=root, Path=Minimum}"
                Maximum="{Binding ElementName=root, Path=Maximum}"
                Template="{StaticResource simpleSlider}"
                Value="{Binding ElementName=root, Path=Slider8Value, Mode=TwoWay}"
                Margin="0,0,80,0"
                Foreground="Red"
                />
    </Grid>

I have the following code, I do not know how to set different colors for the sliders