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Acrylic Mirror Sheet: Silver Sprayed on Tannin-Treated Acrylic
Charlie

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Charlie

20. uMfumfu 2026DE
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Acrylic Mirror Sheet: Silver Sprayed on Tannin-Treated Acrylic

Silver from a chemical bath barely sticks to acrylic: tannin in plain water gave no bond at all. Philips' Ponjee and Verwijlen (US 4,639,382, 1987) found that tannin dissolved in water mixed with an organic solvent such as ethanol makes the silver hold firmly, without etching or clouding the acrylic. The sheet is dipped for a minute, sensitised with a weak stannous chloride spray, then silvered by spraying the silver solution and the reducer together. In the patent's cross-cut test, no squares of silver came off. The picture: our diagram.
Ophakathi
2 hours

Imiyalelo

1

Dip in tannin solution for one minute

Make a solution of 2.3–5.0 g of tannic acid per litre in water with 15–60 % ethanol by volume. Dip the acrylic sheet in it for one minute.

Izinto zokwakha zalesi sinyathelo:

Ipuleti Le-akhrilikiIpuleti Le-akhriliki1 ucezu

Amathuluzi adingekayo:

I-Tannic AcidI-Tannic Acid
I-ethanol - izinga lelabhorethri, 95 %I-ethanol - izinga lelabhorethri, 95 %
Amanzi AcwengisisiweAmanzi Acwengisisiwe
Amathileyi engilaziAmathileyi engilazi
Isilinda esinezilinganisoIsilinda esinezilinganiso
Isikali sesilinganisoIsikali sesilinganiso
Amagilavu erabhaAmagilavu erabha
2

Rinse with water

Rinse the sheet with water.

Amathuluzi adingekayo:

Amanzi AcwengisisiweAmanzi Acwengisisiwe
Ibhodlela LokuhlambululaIbhodlela Lokuhlambulula
3

Spray with stannous chloride for 12 seconds

Spray the face to be silvered with a solution of 0.1 g stannous chloride and 0.1 ml concentrated hydrochloric acid per litre of water, for 12 seconds. Rinse off the excess with water.

Amathuluzi adingekayo:

I-Stannous ChlorideI-Stannous Chloride
I-hydrochloric acidI-hydrochloric acid
Amanzi AcwengisisiweAmanzi Acwengisisiwe
Ibhodlela lokufafaza amanziIbhodlela lokufafaza amanzi
Ibhodlela LokuhlambululaIbhodlela Lokuhlambulula
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha
4

Spray silver and reducer together

Atomise two solutions onto the face at the same time: silver nitrate with ammonia in water, and formalin in water. The patent gives no strengths: as required. Ours: a twin-nozzle spray gun.

Izinto zokwakha zalesi sinyathelo:

I-Silver NitrateI-Silver Nitrate1 as required

Amathuluzi adingekayo:

Isixazululo se-ammonia - 25-28 %Isixazululo se-ammonia - 25-28 %
Isixazululo se-formaldehyde (i-formalin engu-37 %)Isixazululo se-formaldehyde (i-formalin engu-37 %)
Amanzi AcwengisisiweAmanzi Acwengisisiwe
Isibhamu Sokufutha Esinemilomo EmibiliIsibhamu Sokufutha Esinemilomo Emibili
Ikhabethe lomusi (elinepayipi)Ikhabethe lomusi (elinepayipi)
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha

Izinto

2

Amathuluzi Adingekayo

16

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