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Potassium Bromide: Iron Bromide and Potash
Potassium bromide is the bromide of photography. Thorpe (1913): iron bromide solution run into hot potash solution until it is just neutral throws down the iron as oxide and leaves potassium bromide in solution, which is filtered, evaporated and crystallised. 100 parts of iron bromide take 56 to 60 parts of potash.
The picture: potassium bromide crystals (Wikimedia Commons).
Àárín
2 days
Ìlànà
1
1
Make the two solutions
Make the two solutions
Dissolve the iron bromide in water and filter it. Dissolve 56 to 60 g of potash, according to its purity, in a little water and heat it.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Irin Bromide100 g
Potassiọ̀mù kaboneti (potash)60 gÀwọn irinṣẹ́ tí a nílò:
Omi
Aṣọ òwú ńlá ìsẹ́
Ìkòkò irin dídà
Òǹwọ̀n ìdọ́gba2
2
Run the iron bromide into the potash
Run the iron bromide into the potash
Pour the iron bromide solution into the hot potash until the liquid is exactly neutral or very faintly alkaline. Iron oxide falls out.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò irin dídà
Bébà litmus
Ìbọ̀wọ́ rọ́bà3
3
Boil and filter
Boil and filter
Boil for some time so the iron oxide settles dense, then filter it off.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò irin dídàAṣọ òwú ńlá ìsẹ́4
4
Dry, then dissolve again
Dry, then dissolve again
Evaporate to dryness. Dissolve the residue again in water: potassium sulphate and other dirt stay behind. Filter.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò irin dídàOmiAṣọ òwú ńlá ìsẹ́5
5
Crystallise
Crystallise
Boil down to specific gravity 1.53, then evaporate further at a gentle heat in a stoneware or enamelled dish, for hard crystals.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò irin dídà
Òǹwọ̀n ìwúwo omi
Àwo Ìgbẹ6
6
Dry at 40 to 50 °C
Dry at 40 to 50 °C
Dry the crystals at 40 to 50 °C, not above, or they crackle and burst.
Àwọn irinṣẹ́ tí a nílò:
Àwo Ìgbẹ
Ẹ̀rọ Ìwọ̀n OoruÀwọn ohun-èlò
2- 100 gÀyè
Ìtọ́nisọ́nà yìí ń ṣe
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