WHEN I was a schoolboy we used to have lots of fun writing secret notes to one another using invisible ink which we bought in small bottles.

To make it appear all you had to do was warm it in front of the fire and the writing would be revealed.

Well, I've tried holding the Evening Press in front of the fire, but it has no effect, the print is still so vague that with my ageing eyesight it still does not become definite enough to read.

It leads me to believe that there must be a world shortage of ink as this vagueness seems to be endemic in the printing industry today, probably ink has become dearer than gold.

K Thomas,

Walton Place,

Acomb, York.

Updated: 10:04 Wednesday, April 28, 2004