  This paper presents RDCSim, an interactive simulator for reaction--diffusion
chemistry (RDC) research, being developed as part of an ongoing project
studying how humans interact with unconventional computing systems.
  While much research into the computational properties of RDC makes use of
simulations, the development of multiple RDC simulations across different
research groups can lead to results that are harder to reproduce. By automating
the storage of parameter values alongside simulation results, RDCSim aims to
make reproducing RDC results painless.
  This paper presents the functionality of RDCSim, and verifies the behaviour
of the underlying chemical simulation using two seminal examples from the RDC
literature: logical AND gates and chemical diodes.
