Is there a material which can be applied to a surface that will block liquids but is dissolved by blood?

The idea is to use the liquid to close a circuit, but only if blood is present.

I'm wondering if there is something I can coat on the circuit to act as a barrier preventing other liquids from reaching the circuit, but that would react to the chemical components of blood by dissolving, allowing the blood to reach and close the circuit.

One application might be in a bandage, to detect if a wound has reopened. The number of liquids in that context is pretty limited. A limited number of false positive edge cases is also acceptable

  • $\begingroup$ What do you mean by "block" ? And what class of liquids ? I assume if blood dissolves it, it won't "block" blood. $\endgroup$ – J. LS Mar 10 '15 at 16:32
  • $\begingroup$ I've elaborated on the question in the body of the post. $\endgroup$ – GetzelR Mar 10 '15 at 16:45
  • $\begingroup$ There lots of substances, that are soluble in water (and also in blood) but insoluble in some of other liquids. $\endgroup$ – Mithoron Mar 10 '15 at 17:41
  • $\begingroup$ Excuse my ignorance. I'm wondering if there is something that reacts specifically to the makeup of blood (as opposed to water), like hydrogen peroxide, but with the effect of dissolving, which can be used as a coating. I've further elaborated the question. $\endgroup$ – GetzelR Mar 10 '15 at 18:04
  • $\begingroup$ There is probably nothing that will react only to blood that might not be fooled by some other material. How specific must it be (e.g. human blood, mammal blood, arthropod blood)? What is the environment in which it must operate? $\endgroup$ – DrMoishe Pippik Mar 10 '15 at 20:51

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