<Li> Luca Signorelli (c. 1445--16 October 1523) </Li> <Li> Alessio Baldovinetti (14 October 1425--29 August 1499) </Li> <Li> Piero della Francesca (c. 1415--12 October 1492) </Li> <Li> Masolino (c. 1383--c. 1447) </Li>

What were paints made from during the renaissance period