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

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Charlie

28. uMfumfu 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.
Ophakathi
1 day

Imiyalelo

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.

Izinto zokwakha zalesi sinyathelo:

I-zinc sulfideI-zinc sulfide1 as required
I-flux engaziwaI-flux engaziwa1 as required

Amathuluzi adingekayo:

Isigqulo NomgquloIsigqulo Nomgqulo
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.

Amathuluzi adingekayo:

I-crucible enesivalo (i-porcelain)I-crucible enesivalo (i-porcelain)
Isithando se-muffleIsithando se-muffle
Udlawu Lwesitsha SokuncibilikisaUdlawu Lwesitsha Sokuncibilikisa
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa
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.

Amathuluzi adingekayo:

Isigqulo NomgquloIsigqulo Nomgqulo

Izinto

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Amathuluzi Adingekayo

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I-phosphor ye-zinc sulfide

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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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