Results for the weathering-resistance testing of coatings for leather, in which the Blue Wool Standards with variations were used, show that the Blue Wool Standards fade at the same rate when exposed behind a fluorinated ethylene/propylene copolymer sheet (FEP) as those exposed without any protection and faster than those behind glass. It is suggested that the use of this ultraviolet-transparent sheet would give a better prediction of actual performance than the glass shielding used for standard exposure conditions in the Standards. In the reply, the results are appreciated but it is pointed out that the anomalies in the behavior of the Standards under glass are well-known and the geometric progression of fading of the Standards observed under glass would not be maintained. A new range of standards would have to be designed to maintain the geometric progression under FEP and this could be an impossible task. It is not thought to be a viable proposition to alter the conditions specified in BS 1006:1971. -- AATA