diff --git a/content/resources/activity-sheets/pigment-madder-lake_assignment.md b/content/resources/activity-sheets/pigment-madder-lake_assignment.md index aad37235..a57afc6a 100644 --- a/content/resources/activity-sheets/pigment-madder-lake_assignment.md +++ b/content/resources/activity-sheets/pigment-madder-lake_assignment.md @@ -1,15 +1,18 @@ # MAKING LAKE PIGMENT WITH MADDER: A HISTORICAL RECONSTRUCTION >_The Making and Knowing Project, Columbia University_
-_Last updated 2022-01-29 by NJR_ +_Last updated 2023-09-29 by NJR_ -Refer also to: -- [Presentation: Madder Lake: History, Chemistry, and Preparation](/documents/pdf/presentation_sp23_rosenkranz_naomi_lakes_madder-history-chem-prep.pdf) - while this is for a different colorant (cochineal), the chemistry of lakes is the same. -- [Making Pigment from Madder: a Trio of Recipes](../sp22_fld_rosenkranz_naomi_madder-lake-trio) - helpful step-by-step fieldnotes for all three recipes +If you are not already familiar with historical pigments and natural colorants, refer to [Presentation: Madder Lake: History, Chemistry, and Preparation](/documents/pdf/presentation_sp23_rosenkranz_naomi_lakes_madder-history-chem-prep.pdf) for more complete information and further explanation of natural colorants and lake pigments. + +[![Presentation: Cochineal Lake: History, Chemistry, and Preparation](/images/madder-lake-presentation.jpg?raw=true)](/documents/pdf/presentation_sp23_rosenkranz_naomi_lakes_madder-history-chem-prep.pdf) +Refer also to: +- [Presentation: Introduction to Pigments & Paints](/documents/pdf/introduction-paints-pigments_njr_2021.pdf) - a general introduction to colorants +- [Making Pigment from Madder: a Trio of Recipes](../sp22_fld_rosenkranz_naomi_madder-lake-trio) - helpful step-by-step fieldnotes for all three madder pigment recipes described below -Lake pigments are a type of pigment prepared from organic natural colorants: plant and animal sources. As most organic natural colorants are soluble, they cannot be mixed -directly with a binding medium and therefore cannot be used as a pigment. These colorants must therefore be extracted and then made insoluble in order to use them as pigments. +## Lake Pigments +Lake pigments are a type of pigment prepared from organic natural colorants: plant and animal sources. As most organic natural colorants are soluble, they cannot be mixed directly with a binding medium and therefore cannot be used as a pigment. These colorants must therefore be extracted and then made insoluble in order to use them as pigments. **Lake pigments:** in general, pigments prepared from soluble natural colorants, formed by precipitating (or adsorbing) the dye onto a colorless or white, insoluble, relatively inert substrate.