Fresh tar usually looks dark, glossy, thick, and sticky. Depending on the source, it may appear black, brown-black, reddish brown, or dark amber when spread thinly.
Fresh tar has a visual character that is hard to mistake once seen: shine, depth, thickness, and movement. It may cling to a brush in strings, slump slowly on a surface, or level into a glossy film. The exact look depends on whether it is wood tar, coal tar, bitumen-like material, or a blended product.
A fresh tin of pine tar can look nearly black in depth but brown at the edge or where it is brushed thinly. Birch tar may be darker and more adhesive in archaeological descriptions. Roofing products can look blacker, heavier, and more uniform because they are made for sealing rather than traditional timber appearance.
Fresh tar often looks wetter than it really is. A glossy surface may remain tacky while lighter fractions evaporate or absorb into the surface below. Dust, insects, fibres, and grit can stick easily during this stage.
Appearance is useful but not enough to identify the material. Many modern mastics, oils, pitches, and sealants look tar-like. Smell, label, source, intended use, and behaviour are needed before a dark glossy material can be named confidently.