What is buon fresco?
a. a good fresco painting
b. when paint is applied to dry plaster wall
c. a technique in which water based paints are applied on wet plaster
d. none of the above

Fresco is the most-durable method of painting murals.

Buon fresco is a technique in which water based paints are applied on wet plaster . Correct C  In fresco secco on the other hand the paints are applied on dry plaster.

. a technique in which water based paints are applied on wet plaster

Explanation:

Buon fresco is a work of art or a means of painting during medieval and Renaissance period in Italy. It involves using of pigment ground in water which is clayish in colour to paint over a thin wet layer wall, which will serve as undercoat, before the master painter's assistant will copy the work of his master on to the wall. The artist will then followed up by applying finishing touches to the paint.

It is a technique that swayed our perception about prehistoric art, which is dated as far back as 1700s BC. Buon fresco was found in the during excavations of Akrotiri on the Island of Greece (Santorini).