We now accept flashing certificates from a broader range of systems

25th October 2018

There are strict rules about the use of flashing images and regular patterns in adverts. This is to reduce the risk of exposing TV viewers that have photosensitive epilepsy to potentially harmful stimuli.


When you submit an ad to us, we automatically run it through a system that tests for this issue as part of the clearance process. The test is commonly known as the Harding test after the inventor of the system.


If your ad edit fails our flashing test, previously we would only accept a Harding Certificate generated by a Cambridge Research Systems testing device that indicated the edit had passed a flashing test.  In consultation with broadcasters, Clearcast has recently made a change to its copy clearance requirements regarding this flash test certification. We have broadened the list of flashing check providers and will now accept a certificate from any device on the DPP (Digital Production Partnership) list that indicates the clocked ad has passed an accepted flashing test.


There are a few specific requirements to this, for example that the tested file must be in the correct video specification and we have put together a checklist of requirements that must all be met before we can accept a test certificate. Clearcast maintain the right to refuse a certificate should we have reason to believe the requirements have not been met or that the commercial poses a potential risk.


Certificates generated by DPP approved systems in accordance with the above must be uploaded to the relevant CopyCentral submission as substantiation and will require discussion with the relevant Clearcast Copy Exec, who will be happy to help with any further questions.


For further information on getting any flashing images in your ad right, please visit this page on our Knowledge Base.