| http://www.w3.org/ns/prov#value | - ially bacteria impermeable when sealed; and, an indicator associated with the package and adapted to be visually observed therewith, the indicator including a pH sensitive dye and a pH adjusting agent, the indicator having a first color under ambient conditions and adapted to change color from the first color to a second color in response to acidic gas or vapor exposure, the pH adjusting agent eff
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