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Ferric Ammonium Citrate: Ferric Hydroxide Dissolved in Citric Acid and Ammonia
Iron and ammonium citrate is the light-sensitive salt of the blueprint (cyanotype). The British Pharmacopoeia formula (US Dispensatory, 1907): throw down ferric hydroxide from ferric sulphate with ammonia, wash it, dissolve it in warm citric acid, add ammonia, and dry the syrup in thin layers below 38 °C to garnet-red scales. Keep it from light.
The picture: ferric ammonium citrate (Wikimedia Commons).
中级
2 days
说明
1
1
Make 10 % ammonia water
Make 10 % ammonia water
Mix 2 parts of strong ammonia (25-28 %) with 3 parts of water to get about 10 %. You need about 460 ml.
此步骤所需材料：
氨水 25-28 %190 毫升所需工具：
蒸馏水
硼硅玻璃烧杯
橡胶手套2
2
Throw down ferric hydroxide
Throw down ferric hydroxide
Mix 320 ml of the ammonia water with 800 ml of distilled water. Dilute 200 ml of ferric sulphate solution with 800 ml of distilled water and add it slowly, stirring briskly, until the mix smells faintly of ammonia. Leave 2 hours, stirring now and then.
此步骤所需材料：
硫酸铁溶液200 毫升所需工具：
蒸馏水硼硅玻璃烧杯
玻璃搅拌棒3
3
Filter and wash
Filter and wash
Pour onto a calico filter. When drained, wash the brown ferric hydroxide with distilled water until the washings are free of sulphate.
所需工具：
粗棉滤布蒸馏水4
4
Dissolve in citric acid
Dissolve in citric acid
Dissolve 80 g of citric acid in 80 g of distilled water and warm it on a water bath. Stir in the drained hydroxide until nearly all of it has dissolved and the acid is saturated.
此步骤所需材料：
柠檬酸80 克所需工具：
蒸馏水
大锅（下层，用于水浴）硼硅玻璃烧杯玻璃搅拌棒
等臂天平5
5
Add ammonia and filter
Add ammonia and filter
Let it cool, add 110 ml of the ammonia water and filter through flannel, adding a little distilled water if needed.
所需工具：
羊毛法兰绒（过滤用）蒸馏水6
6
Dry to scales
Dry to scales
Evaporate to a syrup, keeping a very slight smell of ammonia. Spread thinly on glass plates and dry below 37.8 °C (100 °F). Lift off the flakes and keep them in a dark, closed jar.
所需工具：
蒸发皿大锅（下层，用于水浴）
玻璃板
温度计
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