Educational aid

A method for controllable toggling viewing of written materials with adjuvant or explanatory notation material as a teaching or memorization tool, wherein the method comprises the steps of:

• i) imprinting adjuvant or explanatory notation materials adjacent to or in close conjunction with a visible text or notation, as a non visible or an invisible imprint;
• ii) selectively causing the non visible or invisible adjuvant or explanatory notation material to become temporarily visible or viewable with a viewing means for a controlled desired period of time;
• iii) using the visible adjuvant or explanatory notation to perform a reading or writing function;
• iv) removing the viewing means, thereby rendering adjuvant or explanatory notation invisible;
• and
• v) repeating steps ii through iv as needed or desired
• wherein the non visible imprint comprises a visible imprint camouflaged from view by being integrated with a heat sensitive ink and wherein the viewing means comprises application of heat to the heat sensitive ink at an activation temperature sufficient to change the color or hue of the heat sensitive ink whereby the non visible imprint becomes visible by contrast thereto and the step of rendering the adjuvant or explanatory notation invisible comprises removing application of heat allowing the heat sensitive ink to cool below the activation temperature.