Whatman Filtercup sample pack containing 3 Filtercup units with grade 3 filters, 2 Filtercup units with GF/C filters and filtercup stem, 1993. Whatman Filtercup sample pack containing 3 Filtercup units with grade 3 filters
14 boxes of W. & R. Balston Ltd. Genuine Whatman Filter Paper, date unknown. Eight boxes are no.54 (in four different sizes), two boxes are no.43, two boxes are no. 42 and two boxes are no.41. Filter papers
Last batch of this hand-made paper produced; made by the same process as that said by Talbot to have been used for his negative work. Whatman's told the donor the process had not changed since Talbot's time. The blue colour is due to smalt in the paper. Whatman's 'Blue Post Wove' paper
