Colorimetric test system designed to control flow of simultaneously released chemicals to a target area

A colorimetric card for detecting a substance, the colorimetric card comprising:

• a first glass ampoule containing a first chemical;
• a second glass ampoule containing a second chemical;
• a filter paper having a first portion adjacent the first glass ampoule and a second portion adjacent the second glass ampoule;
• and
• an encapsulation covering the filter paper and each glass ampoule,
• wherein the encapsulation comprises a window defining a target area of the filter paper;
• wherein the filter paper comprises a design adapted for automatically controlling a first flow of the first chemical and a second flow of the second chemical to the target area after simultaneously releasing the first and second chemicals;
• wherein the design comprises a first air channel disposed in the filter paper between the first glass ampoule and the target area and a second air channel disposed in the filter paper between the second glass ampoule and the target area;
• wherein the first air channel is longer than the second air channel;
• wherein the first air channel is adjacent the first glass ampoule;
• and
• wherein a portion of the filter paper is between the second air channel and the second glass ampoule.

A colorimetric method for detecting a substance, comprising:

• providing a card for detecting a substance, the card comprising:
• a first chemical container adapted for releasing a first chemical;
• a second chemical container adapted for releasing a second chemical;
• a porous flow modulation sheet having a first portion adjacent the first chemical container and a second portion adjacent the second chemical container;
• and
• an encapsulation covering the flow modulation sheet and each chemical container,
• wherein the encapsulation comprises a window defining a target area of the porous flow modulation sheet;
• wherein the flow modulation sheet comprises a design adapted for automatically controlling a first flow of the first chemical and a second flow of the second chemical to the target area;
• wherein the design comprises a first air channel disposed in the flow modulation sheet between the first chemical container and the target area and a second air channel disposed in the flow modulation sheet between the second chemical container and the target area,
• wherein the first air channel and the second air channel have different lengths;
• applying the substance to the target area;
• and
• simultaneously releasing the first and second chemicals.