B (CI 45170) (
aniline yellow (CI 11000) (
S (CI 27195) (
(CI 42040) (
from Sigma-Aldrich Inc., St. Louis, MO, USA. Methylene blue (CI 52015)
(
violet 2B (CI 42535) (
(
Undyed, degummed, unmordanted silk (2-ply, 66 Tex, thread count 43
cm–2) and undyed, washed, unmordanted wool cloth
(3-ply, 158 Tex, thread count 36 cm–2) from the
Monitoring of Damage to Historic Tapestries project (MODHT) (FP5,
EC contract number EVK4-CT-2001-00048)26 ,27 and undyed
cotton cloth locally purchased (thread count 32 cm–2) were used as the reference cloths (microscope images of reference
cloths in
from Fisher Scientific, Waltham, MA, USA. Dye samples from Lehne’s
handbook, 1893 (
2.6 cm) were bought locally, while water-sensitive paper (Pentair
Hypro) was purchased from Agratech NW Ltd., Rossendale, UK.