Discovered by Sir William Herschel.  As ever, a beautiful pair, even in very poor seeing.  Not separated x21, easy x53, but best seen x84 (x140 was slightly worse).  I estimated the PA at about 300°.  The primary is a lovely deep yellow, but I find the colour of the comes difficult to define.  In my old Japanese 3 inch refractor, it usually appeared lilac or purple-ish, and so it seemed at times tonight, but in the end I decided - not without hesitation - that it was really orange.  Flammarion described this pair as "yellow and lilac".  There is almost complete unanimity about the yellow hue of the primary, but descriptions of the companion vary wildly, from Webb's purple to the "pale garnet" seen by Franks.  Hershel and South, who both saw the primary as red, described the comes as green, which seems quite irreconcilable with its spectral class (or indeed any spectral class).  Dembowski thought the companion was red, but Espin's description of it as "pale red" is perhaps closest to my own impression of an orange tint.