The E173 colouring, which gives a silver colour to food, used in pastry making, is a special case in the family of colourings.
While it is accepted that it does not, a priori, represent a danger when consumed rarely and in very small quantities, it would be potentially dangerous when consumed regularly and over the long term.
This additive, along with all others containing aluminium, contributes significantly to total aluminum intake, which is too high for a large portion of the population.
This is a cause for concern because aluminium can accumulate in the body throughout life and can impact fertility, the nervous system, and bone development. Aluminium has been shown to have neurotoxic effects on dialysis patients (who do not have sufficient kidney function to properly eliminate aluminium).
A possible link between aluminium intake and neurodegenerative diseases in humans has also been suggested.
Do not give these to children, and make sure they don't nibble on them by the dozen thinking they are sweets…