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APA
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Visual & Performing Arts
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Coursework
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English (U.S.)
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Questions 3-4

Coursework Instructions:

Question 3.
a) Why do you have only one day to paint a fresco? (explain the reason in your own words, stating the chemical reaction that takes place. Please do not google the question, answered it based on your reading and the lab handout)
b) What chemical reaction takes place when you mix tannin with ferrous sulfate? Describe the reaction in details and what you observe when performing the experiment
Question 4
True or false? (explain your answer)
* A pigment is not useful for the fresco technique if it decomposes (reacts) with highly alkaline substances 

* I can use either Fe(II) sulfate or Fe(III) sulfate to make iron gall ink 

* An oil can be used as a binder if it contains a high percentage of saturated fat 

* Painting using egg yolk is similar in part to painting with oil

Coursework Sample Content Preview:

Questions 3-4
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Questions 3-4
Question 3
a) Why do you have only one day to paint a fresco?
Painting a fresco requires one day to paint because the plaster dries quickly. Unlike oil paints or acrylic paints, fresco paintings cannot be painted over, which makes every mark or stroke permanent. If the painter or artist is dissatisfied with the artwork, or a segment of the artwork, both paint and plaster must be scrapped off when still wet. If the artwork is already dried, it must be chipped off then the process starts all over again.
b) What chemical reaction takes place when you mix tannin with ferrous sulfate? Describe the reaction in details and what you observe when performing the experiment
Mixing of tannin with ferrous sulfate produces a complex, water solvent dark pigment known as ferrotannate, or ferrogallotannate when exposed to oxygen. Little amounts of pigments form by reacting with the oxygen contained in water. However, significant amounts of pigments are produced after the ink is ap...
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