Reply: The GIRM prescribes candles for Mass “as a sign of reverence and festiveness” (nos. 79, 269). But it makes no further determination regarding the material of their composition, except in the case of the sanctuary lamp, the fuel for which must be oil or wax (see “Holy Communion and Worship of the Eucharist outside Mass,” Introduction no. 11). The faculty that the conferences of bishops possess to choose suitable materials for sacred furnishings applies, therefore, to the candles for Mass. That faculty is limited only by the condition that in the estimation of the people the materials are valued and worthy and that they are appropriate for sacred use. Candles intended for liturgical use should be made of material that can provide a living flame without being smoky or noxious and that does not stain the altar cloths or coverings. Electric bulbs are banned in the interest of safeguarding authenticity and the full symbolism of light: .