Barcoded indicators for quality management

1. A barcoded indicator operative to provide a machine-readable indication of exceedance of at least one threshold by at least one product quality affecting parameter, said barcoded indicator comprising:

at least a first barcode including at least a first set of initially uncolored, colorable areas including at least one initially uncolored colorable area, positioned at locations between bars of said first barcode when said first barcode is in a first barcode readable state prior to exceedance of said at least one threshold;

at least a second barcode including at least a second set of initially uncolored, colorable areas including at least one initially uncolored colorable area, positioned at locations of bars of said second barcode which appear only when said second barcode is in a second barcode readable state following exceedance of said at least one threshold;

a coloring agent located at a first location on said indicator; and

a coloring agent pathway operative to allow said coloring agent to move, at a rate which is at least partially a function of time, from said first location to said first and second sets of colorable areas for coloring thereof,

said at least a second barcode being in a second barcode unreadable state prior to exceedance of said at least one threshold wherein as the result of said at least a second set being uncolored, more than a single narrow barcode bar is missing from said at least a second barcode, and

upon exceedance of said at least one threshold said at least a first barcode becoming unreadable as the result of coloring of at least a portion of at least one colorable area forming part of said at least a first set of colorable areas and generally simultaneously said at least a second barcode becoming readable as the result of coloring of said at least a second set of colorable areas.

2. A barcoded indicator according to claim 1 and wherein said coloring agent pathway is operative to allow said coloring agent to move by diffusing from said first location to said first and said second sets of colorable areas.

3. A barcoded indicator according to claim 1 and wherein said first set of colorable areas continues to be colored following exceedance of said at least one threshold.

4. A barcoded indicator according to claim 1 and wherein said at least one threshold includes at least one time threshold.

5. A barcoded indicator according to claim 1 and wherein said at least one threshold includes at least one time and temperature threshold.

6. A barcoded indicator according to claim 1 and wherein said quality indicator is operative to provide indications of exceedance of several different thresholds.

7. A barcoded indicator according to claim 1 and wherein at least one colorable area forming part of one of said first set of colorable areas and said second set of colorable areas has a width of a single narrow barcode bar.

8. A barcoded indicator according to claim 1 and wherein colorable areas forming part of at least one of said first set of colorable areas and said second set of colorable areas become colored sequentially.

9. A barcoded indicator according to claim 1 and wherein at least one of said first set of colorable areas and said second set of colorable areas includes at least two colorable areas.

10. A barcoded indicator according to claim 9 and wherein each of said first set of colorable areas and said second set of colorable areas includes at least two colorable areas.

11. A barcoded indicator according to claim 1 , operative to provide a machine-readable indication of exceedance of at least one additional threshold by at least one product quality affecting parameter, said barcoded indicator further comprising:

at least a third barcode including at least a third set of initially uncolored, colorable areas including at least one initially uncolored colorable area, positioned at locations of bars of said third barcode which appear only when said third barcode is in a third barcode readable state following exceedance of said at least one additional threshold,

said at least a third barcode being in a third barcode unreadable state prior to exceedance of said at least one additional threshold wherein as the result of said third set of colorable areas being uncolored, more than a single narrow barcode bar is missing from said at least a third barcode,

said at least a second barcode including at least a fourth set of initially uncolored, colorable areas including at least one initially uncolored colorable area, positioned at locations between bars of said at least a second barcode when said at least a second barcode is in said second barcode readable state prior to exceedance of said at least one additional threshold, and

upon exceedance of said at least one additional threshold said at least a second barcode becoming unreadable as the result of coloring of at least a portion of at least one colorable area forming part of said at least a fourth set of colorable areas and generally simultaneously said at least a third barcode becoming readable as the result of coloring of said at least a third set of colorable areas.