The use of sodium hyposulphite as solvent, and sodium sulphide as precipitant, was proposed in 1846 by Hauch and in 1850 by Percy, and put into practice in 1858 by Patera (Patera process); calcium hyposulphite with calcium polysulphide was first used by Kiss in 1860 (Kiss process, now obsolete); sodium hyposulphite with calcium polysulphide was adopted about 1880 by 0.
Johannes Carsten Hauch (q.v.; 1790-1872) first distinguished himself as a disciple of Ohlenschlger, and fought under him in the strife against the old school and Baggesen.
But the master misunderstood the disciple; and the harsh repulse of Ohlenschldger silenced Hauch for many years.
All that Hauch wrote is marked by great qualities, and by distinction; he had a native bias towards the mystical, which, however, he learned to keep in abeyance.
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