艺术
美容与健康
工艺
文化与历史
娱乐
环境
食品与饮料
逆向工程
科学
体育
技术
可穿戴设备
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).
中级
2 days
说明
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.
此步骤所需材料：
溴化铁100 克
碳酸钾（草木灰碱）60 克所需工具：
水
粗棉滤布
铸铁锅
等臂天平2
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.
所需工具：
铸铁锅
石蕊试纸
橡胶手套3
3
Boil and filter
Boil and filter
Boil for some time so the iron oxide settles dense, then filter it off.
所需工具：
铸铁锅粗棉滤布4
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.
所需工具：
铸铁锅水粗棉滤布5
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.
所需工具：
铸铁锅
比重计
蒸发皿6
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.
所需工具：
蒸发皿
温度计此蓝图制作
CC0 公共领域
此蓝图以 CC0 协议发布。你可以自由复制、修改、分发和使用此作品，无需征得许可。
通过购买蓝图中的产品支持创客，他们将获得 创客佣金 （由供应商设定），或创建此蓝图的新版本并将其作为连接包含在你自己的蓝图中以分享收入。