RSI barograph ink is specifically designed for use with drum recorders including barographs and chart papers. The ink is slow drying and slow to evaporate making it perfect for use with a wet bucket nib.
The squeeze bottle allows you to apply one or two drops of ink into the bucket of the metal nib which will last for around one week of recording. A 10ml bottle of RSI ink should last around 18months.
Available in either Blue: for use with Barographs; Green: for use with Hygrographs or Red for use with Thermographs.