cochineal pigment
Turkey
Recipe Details
Ingredients
cochineal, alum
Preparation Steps
Red ink prepared according to Nefeszade (1938) using cochineal pigment and alum [KAl(SO4)2.12H2O] (p. 95). FTIR spectra showed sulphate bands at 1108 and 1155 cm-1 and alum bands at 1314 and 1427 cm-1. No gum Arabic was detected (p. 95).
Original Recipe Text
Red ink prepared according to Nefeszade (1938) using cochineal pigment and alum [KAl(SO4)2.12H2O] (p. 95). FTIR spectra showed sulphate bands at 1108 and 1155 cm-1 and alum bands at 1314 and 1427 cm-1. No gum Arabic was detected (p. 95).
Evidence
"The cochineal pigment is a stable pigment and non-corrosive."
Remarks
The pigment is described as stable and non-corrosive, with no significant changes observed in the carbonyl vibration region of the spectrum (p. 95). However, a decrease in -OH absorption intensity (3330-3350 cm-1) was noted after ageing due to pH lowering or moisture loss (p. 95).
Scientific Analysis
Chemical CompositionKAl(SO4)2.12H2O (alum)
Analytical Techniques
FTIR
Certainty Level
Confirmed
Instrumentally Verified
Verified
Metadata
Material Type
pigment
Binderalum
ColorRed
RegionTurkey
Source Information
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