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Zinc Sulphide Phosphor: Precipitated Sulphide Heated to Redness with a Flux (Thorpe 1913)
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Charlie

28. Ukwakira 2026DE
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Zinc Sulphide Phosphor: Precipitated Sulphide Heated to Redness with a Flux (Thorpe 1913)

Precipitated zinc sulphide does not glow. Heated to redness together with an alkali chloride or the sulphide of another metal, it turns into the phosphorescent sulphide used for fluorescent screens. Source: Thorpe, Dictionary of Applied Chemistry vol. 5 (1913), Zinc. Unknown: which chloride or sulphide, how much, and for how long. Thorpe names only the class, so the additive is linked to an unknown head. Crucible and furnace are ours. Picture drawn by Youblob.
Hagati
1 day

Amabwiriza

1

Mix the sulphide with the additive

Grind precipitated zinc sulphide together with an alkali chloride or the sulphide of another metal. Unknown: which one and how much. Thorpe names only the class.

Ibikoresho by'iyi ntambwe:

Sulfide ya zincSulfide ya zinc1 as required
Ikiyengesha kitazwiIkiyengesha kitazwi1 as required

Ibikoresho bikenewe:

Isekuru n'UmuhiniIsekuru n'Umuhini
2

Heat to redness

Heat the mixture to redness (ours: in a lidded porcelain crucible in a muffle furnace). Unknown: for how long. Let it cool.

Ibikoresho bikenewe:

Ikirundo cyo gushongeramo gifite igifuniko (porukorene)Ikirundo cyo gushongeramo gifite igifuniko (porukorene)
Ifuru ya muffleIfuru ya muffle
Amakoro y'Icyombo GishongeshaAmakoro y'Icyombo Gishongesha
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
3

Check the glow

Grind the cooled cake gently. Expose a little to light, then look at it in the dark: the phosphorescent sulphide glows.

Ibikoresho bikenewe:

Isekuru n'UmuhiniIsekuru n'Umuhini

Ibikoresho

2

Ibikoresho bikenewe

5

Iki gishushanyo gikora

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Fosifore ya sulifire ya zinki

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Zinc Sulphide: Zinc Sulphate, Ammonia and Carbon Disulphide in a Closed Digester (1900)
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Zinc Sulphide: Zinc Sulphate, Ammonia and Carbon Disulphide in a Closed Digester (1900)

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