  The usual construction of link invariants from quantum groups applied to the
superalgebra D_{2 1,alpha} is shown to be trivial. One can modify this
construction to get a two variable invariant. Unusually, this invariant is
additive with respect to connected sum or disjoint union. This invariant
contains an infinity of Vassiliev invariants that are not seen by the quantum
invariants coming from Lie algebras (so neither by the colored HOMFLY-PT nor by
the colored Kauffman polynomials).
