Support, preparation and surface
A painting has a support, sometimes a preparatory layer, and paint. Canvas, panel and paper are different supports. A label often identifies the technique without explaining every stage of manufacture. The visible surface does not let you reconstruct a precise recipe. Start by recording documented terms, then describe the apparent thickness, contours and transitions you can actually observe.
Colour does not describe the entire material
Pigment and binder have different roles. Pigment contributes colour; binder holds particles together and helps form the layer. A named technique can encompass varied practices and combined processes. A reproduction cannot identify a pigment on its own. When comparing paintings, ask how the material contributes to their appearance, rather than relying only on the subject or the colour shown on your phone.
Relief, transparency and gesture
Thin layers and thick paint interact differently with light. Look at reworking, edges, tool marks and transitions between areas. Change position slightly within the permitted space. Vocabulary should clarify an observation, not automatically assign an intention. A smooth surface can result from elaborate work; a visible mark need not be improvised. Compare your hypotheses with the detailed object record.
What technical study can reveal
Getty explains how observation and imaging complement the study of paintings. They can reveal aspects of construction and changes below the surface. Those results require professional interpretation: cracks seen from a gallery do not date an alteration. Consult the museum’s conservation publications and separate clues from conclusions. For a personal exercise, compare paintings with similar subjects and describe three material differences before discussing style.
Common questions
Can you identify oil paint with certainty by looking?
Appearance offers clues; the object record and material study are needed to confirm the technique.
Do cracks reveal recent damage?
No. Appearance alone does not date an alteration or replace professional examination.
Does photography convey surface relief?
Depending on lighting it can show some relief. A frontal view does not capture the entire surface.
Method and references
Reading advice and exercises written for this guide. The references extend the documentary and technical explanations. Check visit conditions with each institution.