These preservative solutions (treatments) were: 2% sucrose, 200 ppm 8-hydroxyquinoline sulfate (8-
HQS), pulsing treatment with 200 ppm 8-HQS in combination with 2% sucrose for 12 h, pulsing the
spikes with 0.2 mM silver thiosulfate (STS) for 1 h, pulsing with 0.2 mM STS for 1 h followed by
2% sucrose solution, or distilled water used as control.