Madder Lake Pigment
Name: Marilyn Bowen and Tianhe Lou
Date and Time:
2015.10.06, 11:35am
Location: Columbia University
Subject: Madder Lake Pigment
(Note: All temp in Celsius)
Took the Madder Lake (which had been left to soak at 6:30 PM on 5 Oct) and began to heat it on hot plate at a minimum heat.
12:00pm
Increased heat to 1
12:03pm
The center of the beaker reaches 70 degrees
The edges are above 70~80 degrees and are starting to form a foam
The heat is lowered to off
12:05
Bubbles starting to form from the bottom of the beaker
Foam is darkening to a light cranberry color with black on top
12:07
Temperature is very unstable, varying between 60 and 80 degrees
12:09
Foam has reduced, temperature is now between 60 and 75 degrees
Smells slightly burnt
Color is a very deep cranberry, not transparent
12:12
Temperature is varying between 65 and 85 degrees, though the heat is off
The foam has reduced almost completely
12:15
Heat seems to be at approximately 70 degrees
The liquid is now very dark, no more bubbles forming.
12:20
Heat still off but the liquid is measuring at approximately 75 degrees
12:23
Removed from heat entirely
Measuring at approximately 68-71 degrees
12:26
Placed back on the hot plate (the heat is off but it's still warm)
12:28
Turned heat to min. as the solution was ~65 degrees
12:30
Solution approx. 67 degrees
12:55
Solution reaches 80 degrees
1:00
Removed from heat
Checked ph--seems to be about 4
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