An alternative form of specifying colors is the floating point wide gamut linear RGB color space (scRGB)
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<Canvas xmlns="http://schemas.microsoft.com/client/2007">
<Rectangle
Fill="sc#1, 1.0, 0.0, 0.0"
Canvas.Left="96"
Canvas.Top="160"
Width="256"
Height="224"
/>
</Canvas>
</UserControl>
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