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Generally a test that lasts two to three hours.
The last supper was amde by Da Vinci after a series of test watercolor versions to the final version in oil, where the dark tones were used to give contrast mid hum to the paintings. The original frame was wood, later on it was replaced by brass.
CRP test
You'll need to play with it some but, for starters use about 10 drops of yellow to 1 drop of red. Test it on a cracker before you mix it all with your food.
Sterile, Light Blue, Red, Gold, Green, Lavender, or Gray. ie "Lavender last" rule is true unless you have a test requiring the gray tube which contains oxalate.