The closest color to #63635e in the CSS4 color palette is dimgrey which in robot-speak is #696969  
Or perhaps you'd like to see the intersection between this color and Crayola® or CSS3 palettes?
  • This object is part of the Textiles collection.
  • There are 43 images of this object.
  • This object is part of the Textiles collection.
  • There are 39 images of this object.
  • Sample Book (Japan)
  • Medium: silk Technique: stencil-dyed.
  • Gift of Rowland Burdon-Muller.
  • 1939-17-6-a/lll
  • This object is part of the Textiles collection.
  • There are 32 images of this object.
  • Panel, ca. 1700
  • Medium: linen Technique: embroidery with open work on plain weave.
  • 1974-99-2
  • This object is part of the Textiles collection.
  • There are 23 images of this object.
  • This object is part of the Textiles collection.
  • There are 16 images of this object.
  • Desk (USA), ca. 1875
  • Oak, nickel-plated metal (probably bronze).
  • Museum purchase from Smithsonian Institution Collections Acquisition Program....
  • 1997-42-1-a/e