Blackstone inks are an Australian ink brand that seems to have been looked over as the fountain pen world was taken by storm by Robert Oster inks, also from Australia. It is shame really because though they do not carry the same range of colours they appear to be good quality inks and are very affordable.
I came across these inks on one of many searches for new brands and it did take awhile before I purchased any as I was waiting for Blackstone pen flush to come back into stock so I could buy some at the same time. I ordered the inks from Justwrite, which is where the inks are made. The blackstone web site list four places in Australia that retail the inks and a number of locations in Europe and the USA. The inks retails for AUD$8 for 30ml which equates to 26.6c a ml (18.5c US and much the same in NZ money) – quite cheap and remaining so even with postage added.
Diamine is an old name in British inks though it’s only been called Diamine for the last 54 years. Established as T Webster and Co. in London in 1864 the company moved to Liverpool in 1925 and in 1964 changed its name to Diamine. Diamine not only make their own inks but inks for other companies such as Yard-o-Led.