The entire reaction was carried out in flasks equipped with a stopper and delivery tube so that the arsine gas could be collected in the absorber solution as shown in Figure 1-2. The arrangement ensures that interferences are left in the reaction flask and only the arsine is collected in the absorber in special transparent containers called cuvettes. reacts with silver As the arsine bubbles into the solution in the cuvette, it diethyldithiocarbamate to form a red complex compound according to the following equation.