Description
Tests on Blue Stamps. Second Trial Plate State 3
3 September 1840
Blue, on un-watermarked white wove paper dipped in “Prussiate of Potash”. Obliterated “No 712” and tested with Prussic Acid, Potash, Tartaric Acid, Turpentine and Creosote. No 2` denotes the shade of blue, and “D-4” the “Order of Goodness” as determined by Messrs. Perkins, Bacon and Co., “5” had been pencilled under the latter.
The Handwriting in ink is that of Joshua Bacon.
On this date six specimens in different shades of blue, numbered “1 to 6”, some of these being on plain paper and some with Prussiate of Potash in the paper, were sent to Rowland Hill by Joshua Bacon.
Magnificent And Unique.
