[3] There is a characteristic infrared absorption band at 2047.5 cm−1 due to stretching of a C=C bond.

[4][3] Maximal concentrations occurred with a carbon disulfide pressure of 0.02 torr.

In molecular clouds, the formation mechanism is speculated to be CCS + CH → CCCS + H.[5] On dust grains, in space the formation mechanism is theorised to be: CCC + H2S → C3•HSH → CCCS + H2 when irradiated with visible or UV light.

The ratio of concentration of sulfur to oxygen analogues follows the same pattern.

[6] CCCS has also been found in the stellar envelope of carbon-rich AGB stars, including in IRC+10216.