[2] He was the son of Captain Reinhold Seehl (d. 1721), a German volunteer who worked his way through the ranks in the Swedish army.
[citation needed] He settled in England and was naturalised as a British subject by Act of Parliament introduced in 1783 (23 Geo c.
There his entry reads "Seehl, Ephraim Rinhold, Copperas Merchant, Blackwall; or at the Bank Coffee-house, Threadneedlestreet."
At this time he was leasing the Copperas Works in Bromley from his brother-in-law, the shipwright John Perry of Blackwall Yard.
With Augustus Sala, Nicolas Lemery and J. C. Bernhardt, Seehl is mentioned as one of those working on methods for its production.