LEVERANSER AV RÅSTOFFER OG VED TIL NØSTETANGEN
POTTASKE OG KVARTSSAND SAMT BLYOKSID OG MANGANOKSID
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Pottaske lages av aske fra brent, tørr bjørkeved.
I en oppløsning med vann kokes den inn til et grått pulver – rå pottaske. I denne prosessen blir kaliumkarbonat (K2CO3) ekstrahert ut av asken, men litt aske er fortsatt med.
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Rå pottaske blandes deretter med kaldt vann og filtreres godt, slik at restene av asken fjernes.
Blandingen kokes inn på nytt og resultatet blir et hvitt pulver som brukes i krystallmengen,
såkalt kalsinert pottaske.
Det er et alkalisk stoff og bidrar til at det sammen med kvartssand og kalk kan smeltes ved 1.200 – 1.300 ° C. ( Smeltepunktet for kvarts alene er ca. 1.700 ° C).
Kvartssand (SiO2) til produksjon av krystall har ekstremt strenge krav til lavt jerninnhold ellers
får glassmassen et grønnskjær. Kvartssanden fra vassdrag har for høyt jerninnhold.
Derfor ble kvartsen til Nøstetangen hentet fra dagbrudd på Solberg gård, brent og knust til fin sand. Dette var nødvendig for at den kunne smeltes sammen med pottaske og kalk.
Ofte ble det tilsatt litt manganoksid, som fargenøytraliserte eventuelt jerninnhold. Det ble da
tilsatt salpeter (KNO3) for å oksidere manganoksiden til riktig farge.
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Blyoksid (BbO) ble tilsatt for å gi krystallet høyere vekt, bedre klang og gode lysbrytningsegeneskaper – et funklende lys.
Oppskriften til krystallmengen ble kalt «Möllers krystallkomposisjon» var oppkalt etter den dyktige kompositøren ved Nøstetangen, tyskeren Martin Möller.
By the suppliers Eiker:
Hildebrand Steinsrud
The son of Christopher Solberg delivered silicon in 1755 was probably most likely Anders Christophersen, who lived
on Hoenseie in 1765, but who took over Solberg after his father Christopher a couple of years later.
Ole Fossum
Sjur Homlebek
Trond Gorud
Jens Waalen
Nils Waalen
Christian Waalen
Ole Raaen ​
More information from GE Christiansen:
From 1748 onwards also Parish Priest Christian Grave vedleveränder_cc781905-5cde-3194-bb3b-136bad5c
From about 1755 Lieutenant Franz Mathiesen
Kartet viser de gårdene som var Nøstetangen glassverks viktigste ved-leverandører fra omkring 1750:
Quartz sand
The place where the glassworks got quartz sand from for its glass production was found thanks to Jan Erik Skretteberg's research over several years. The glass mass used to make white glass consists of approx. 2/3 parts quartz sand.
To make crystal, which Nøstetangen was the first glassworks outside England to do, pure quartz was needed.
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In 1755, the owner of Solberg farm was employed as a silicon miner at Det norske Kompani, with responsibility for the extraction, burning and crushing of quartz. Fragments of the story are found in a number of books and documents from the 18th century, but 7. May 2021, the quartz quarry was found with the help of a local acquaintance with a great interest in local history.
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Quartz was also delivered from this quarry to Krystallhytta at Hurdal Glasværk, after Nøstetangen was closed.
The deliveries took place in winter with sledges and horses. The story is unique and gives a complete picture of Nøstetangen's important position in Norwegian glass history.
Found
After several years of searching in written documents (Hans Strøm's topographical description of Eiker,
GE Christiansen's book De Gamle Privilegerte Norske Glassverker and Christiania Glasmagasin,
Ada Buch Polak's book Gammelt Norsk Glass m.fl.) after the source for the raw material quartz sand which makes up
about. 67% of the amount of glass mass, finally managed to get in touch with a local acquaintance
with great interest in the Solberg vase and Nøstetangen, to find the source.
On Friday 7 May 2021, he detected the quartz quarry on the farm Solberg. It testifies to a major breach, however
after more than 200 years, it is largely overgrown with forest floor and trees. There are still quartz stones
in the surface in some places. Pictures of the place and quartz samples are secured.
Background / The importance of the find
After several years of extensive industrial espionage in England, by agent Morten Wærn, Nøstetangen succeeded
Glassworks to develop their own variant of the popular lead crystal that was only made in England.
But, to make a clear and pure crystal mass, one had to have quartz sand with extremely low iron content.
Such sand was difficult or impossible to find in Norway.
The solution was therefore to break quartz and crush it into sand to melt crystal mass. The owner on
In 1755, Solberg gård was employed by the board of Det norske Kompani as a silicon miner, with responsibility for mining.
of quartz, firing and crushing, so that it could be fused with potash and lime to an exquisite
crystal mass.
Thus, the above-mentioned discovery of quartz at a distance of a few kilometers to the glassworks was decisive for the work
success, which eventually came on par with the glassworks in England and Bohemia.
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Hans Strøm mentions that quartz from the quarry at Solberg farm was delivered to Krystallhytta at Hurdal Værk
when this took over the production of small glass from Nøstetanten Glasværk.
