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The optical surface brightness of dark nebulae is mainly due to scattering ofintegrated starlight by classical dust grains. It contains information on theimpinging interstellar radiation field, cloud structure, and grain scatteringproperties. We have obtained spectra of the scattered light from 3500 to 9000Angstrom in two globules, the Thumbprint Nebula and DC303.8-14.2.  We use observations of the scattered light to study the impinging integratedstarlight spectrum as well as the scattered H-alpha and other line emissionsfrom all over the sky. We search also for the presence of other than scatteredlight in the two globules.  We obtained long-slit spectra encompassing the whole globule plus adjacentsky in a one-slit setting, thus enabling efficient elimination of airglow andother foreground sky components. We calculated synthetic integrated starlightspectra for the solar neighbourhood using HIPPARCOS-based stellar distributionsand the spectral library of Pickles.  Spectra are presented separately for the bright rims and dark cores of theglobules. The continuum spectral energy distributions and absorption linespectra can be well modelled with the synthetic integrated starlight spectra.Emission lines of H-alpha + NII, H-beta, and SII are detected and areinterpreted in terms of scattered light plus an in situ warm ionized mediumcomponent behind the globules. We detected an excess of emission over thewavelength range 5200-8000 Angstrom in DC303.8-14.2 but the nature of thisemission remains open.

Spectroscopy of diffuse light in dust clouds. Scattered light and the solar neighbourhood radiation field