Time validation indicator

A method for fabricating a time validation indicator, said method comprising:

• forming a receiving layer that comprises;
• (i) one or more masking colorants, wherein the masking colorant is a leuco dye that is capable of reversibly forming a colored carbonium ion species;
• and
• (ii) one or more deactivators comprising an electron accepting compound and a fluoropolymer, wherein the one or more deactivators cause and maintain said one or more masking colorants to be in an initial colored state;
• forming an activating layer that comprises one or more migratory activators that migrate into said receiving layer upon at least a portion of said receiving layer being placed in contact with at least a portion of said activating layer to initiate a predetermined time period;
• and
• placing at least a portion of said receiving layer in contact with at least a portion of said activating layer to initiate the predetermined time period and the migration of said one or more migratory activators into said receiving layer,
• wherein the migration of said one or more migratory activators into said receiving layer causes at least a portion of said one or more masking colorants to advance to a final colorless state resulting in a visual color change of said receiving layer that indicates the predetermined time period has elapsed.

A method for indicating a predetermined time period has elapsed, said method comprising:

• providing a time validation indicator that comprises;
• a receiving layer comprising;
• (i) one or more masking colorants, wherein the masking colorant is a leuco dye that is capable of reversibly forming a colored carbonium ion species;
• and
• (ii) one or more deactivators comprising an electron accepting compound and a fluoropolymer, wherein the one or more deactivators cause and maintain said one or more masking colorants to be in an initial colored state;
• and
• an activating layer comprising one or more migratory activators that migrate into said receiving layer to cause at least a portion of said one or more masking colorants to advance to a final colorless state that results in a visual color change of said receiving layer;
• placing at least a portion of said receiving layer in contact with at least a portion of said activating layer to initiate the predetermined time period and the migration of said one or more migratory activators into said receiving layer, and
• detecting said visual color change of said receiving layer that indicates the predetermined time period has elapsed.