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Instead of glass filters, why gelatin filters could not be used for a long period while both are Absorption filters?

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Instead of glass filters, why gelatin filters could not be used for a long period while both are Absorption filters?

(a) Gelatin tends to evaporate and hence they deteriorate

(b) Gelatin is affected by humidity in the environment

(c) They deteriorate due to absorption of heat leading to changes in gelatin

(d) Gelation is affected by temperature in the environment

I got this question in an interview.

My question is from Absorption Instrumentation and Block Diagram Representation in portion Colorimetry and Spectrometry of Analytical Instrumentation

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Correct choice is (c) They deteriorate due to absorption of heat leading to changes in gelatin

For explanation: With the absorption of heat they deteriorate due to changes in gelatin. Bleaching of dye occurs.

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