Making invisible ink

Write a message in invisible ink on plain A4 paper, creating a testing a series of chemical concentrations to see which is best.

Explore the principles of chemical reactions in this experiment about creating invisible ink.

Make your lessons pop

Choose an account option to continue exploring our full range of articles and teaching resources

Free

Free access for everyone, everywhere. If you only need a few resources, start here.

UK and Ireland only

Free for eligible users

Free and comprehensive access for teachers and technicians at secondary schools, colleges and teacher training institutions in the UK and Ireland.

£80 per year

Get unlimited articles and resources each month, plus discounts on professional development courses.