  We combine HST/NICMOS imaging photometry of the HR 4796A disk at previously
unobserved wavelengths between 1.71-2.22\micron with reprocessed archival
observations to produce a measure of the dust's scattering efficiency as a
function of wavelength. The spectrum of the dust, synthesized from the seven
photometric measures, is characterized by a steep red slope increasing from 0.5
\micron to 1.6 \micron followed by a flattening of the spectrum at wavelengths
$>$ 1.6 \micron. We fit the spectrum with a model population of dust grains
made of tholins, materials comprised of complex organic materials seen
throughout the outer parts of our Solar System. The presence of organic
material around a star that may be in the later stages of giant planet
formation implies that the basic building blocks for life may be common in
planetary systems.
