You might also want to wait until the color clears off the sprite before changing the score again or you find the score goes up really fast! Maybe something like this...
[blocks]
<forever>
<if><< <touching color[ red <or> <touching color[ blue >>
<change{ score }by( 1
<end>
<wait until><< <not> << <touching color[ red <or> <touching color[ blue >> >>
<end>
[/blocks]
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