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the diaper, two 6.5 pound weights are placed on either end of the sheet in order to mimic the weight of the baby on top of the diaper. 

[0095] Synthetic urine is then prepared according to the following recipe as disclosed in U.S. Pat. No. 6,772,708 to Klofta. The synthetic urine is then heated to a temperature of 38° C. in order to mimic body temperature of urine. 40 milliliters of this heated synthetic urine is then measured into a graduated cylinder. This 40 milliliters of the synthetic urine is then poured into the polycarbonate cylinder on top of the diaper at a rate of approximately 2 to 3 milliliters per second. After all of synthetic urine is poured into the cylinder, a stop watch is started. An additional fort~ milli› liters is poured into the cylinder at a rate of approximately 2 to 3 milliliters per second at both the 5 and 10 minute time points as measured using the stop watch. 

[0096] The color of the wetness indicator is then moni› tored (as can be seen through the backsheet) at the following time points after the stop watch is started after the first 40 milliliter volume of synthetic urine is poured into the cylinder: 1) 2 minutes and 2) 5 minutes. After the second dose of 40 milliliters of synthetic urine is added at the 5 minute point, observations are recorded at the 10 minute point, and after the third dosed of 40 milliliters is added at the 1 O minute point, final observations are recorded at the 15 minute point. The color can be measured using the following 6-point scale of Oto 5: 

[0097] O denotes no color change of the wetness indi› cator through the backsheet film remaining in its dry state color, such that the wetness indicator remains completely yellow over the backsheet film area corre› sponding to the wetness indicator area; 

[0098] 1 denotes less than 10% of the backsheet film area corresponding to the wetness indicator area chang› ing to the wet state color; 

[0099] 2 denotes 10-40% of the backsheet film area corresponding to the wetness indicator area changing to the wet state color; 

[0100] 3 denotes 41-60% of the backsheet film area corresponding to the wetness indicator area changing to the wet state color; 

[0101] 4 denotes 61-90% of the backsheet film area corresponding to the wetness indicator area changing to the wet state color; and 

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[0102] 5 denotes greater than 90% of the backsheet film area corresponding to the wetness indicator area chang› ing to the wet state color. 

C. Colorant Retention Test Method: 

[0103] The colorant retention test is performed on the identical diaper used in the colorant kinetic test. The diaper comprising the wetness indicator continues to be sand› wiched between the polycarbonate sheets described in the colorant kinetic test method (above) and continues to be weighted down for a total of 2 to 16 hours. 

[0104] After this range of time is met, the tin_ie i_s recor~ed and the diaper is flipped over so the wetness md1cator side faces up for easy viewing by the naked eye. Both the color of the wetness indicator (as viewed through the backsheet), as well as the areas located next to it are inspected to determine dye retention within the wetness indicator, as well as dye leaching into areas residing next to the wetness indicator. Even though the color could be measured spec› trophotometrically, a visual grading system can also be applied. The color of wetness indicator can be graded according to the following scale: 

[0105] O denotes less than 10% of final wet state color residing within the wetness indicator through the back› sheet film; 

[0106] 1 denotes 10% to 50% of the final wet state color remaining within the wetness indicator through the backsheet film 

[0107] 2 denotes 51 % to 90% of the final wet state color remaining within the wetness indicator through the backsheet film; and 

[0108] 3 denotes greater than 90% of the final wet state color remaining within the wetness indicator through the backsheet film. 

Any colorant leaching into the surrounding areas in_ the vicinity of the wetness indicator is simply recorded with a yes or no designation. A "yes" denotes the observation of some of the wet state color residing in the areas around the wetness indicator. A "no" denotes the presence of no wet state color within the surrounding areas. 

[0109] 

