     else if glyphspec.left?   # use bounds
       params = ['left','right','bottom','top']
     
-    params.push.apply(params, ["angle","color:color", "bordercolor:color","alpha"])
+    params.push.apply(params, ["angle","color:string", "bordercolor:string","alpha"])
     metaglyph = new MetaGlyph(params, glyphspec, this)
 
     @plot_view.ctx.save()

      ctx = @plot_view.ctx
      ctx.globalAlpha = glyph.alpha
      if glyph.fillcolor != "none"
        ctx.fillStyle = glyph.fillcolor
        ctx.fillRect(left, bottom, right-left, top-bottom)
      if glyph.strokecolor != "none"
        ctx.strokeStyle = glyph.strokecolor
        ctx.rect(left, bottom, right-left, top-bottom)
      # End per-datapoint loop



      if not (attrname of @glyphspec)
        # The field is absent from the glyph specification.
        # Use the default field name and check for its existence on the
        # datapoint. If it doesn't exist, then read the defaults from the
        # styleprovider. The default value of `units` is always `'data'`.
        if attrname of datapoint
          glyph[attrname] = datapoint[attrname]
        else
          glyph[attrname] = @styleprovider.mget(attrname)
        glyph[attrname+'_units'] = 'data'
        continue
      
