The three magic inks in the RUNED universe react differently depending on light and temperature.
Heat-Sensitive Ink
This ink disappears at temperatures above 29°C (84°F) and reappears when it cools down.
In hot summer months, the ink may not return until the temperature drops.
In winter, the ink needs to reach at least 29°C (84°F) before it vanishes.
If your fingers are too cold, the ink won't react to touch. Instead, try using a heater or a hairdryer from a safe distance with parental supervision.
Warning: Never heat book pages with an open flame, as this poses a fire hazard.
The Two UV Inks
Ink A → Glows in the dark after being charged with the UV lamp.
Ink B → Only visible under direct UV light but does not glow afterward.
If the inks do not react as expected, check the light conditions and temperature.
Enjoy uncovering the hidden clues.