Sentence:  Let your light <WSD>drabs</WSD> be next. Do not put anything in your liquor after your greys, except a pint of this ebony liquor; stir it up well, and handle in your silks for light <WSD>drab</WSD> for twenty minutes, and they are done; [...] The next <WSD>drab</WSD> you dye in the vat is a dark stone <WSD>drab</WSD>. 
Meaning of the word marked with <WSD> tags:  The colour of this fabric.