I collect old colour slides from time to time. Mostly Kodachrome. I always assumed that any slides I acquire are safety film rather than nitrate. But when I think about it I don't know this for certain, so can anyone give or point to information about whether Kodachrome or other relevant stocks were ever issued on nitrate bases? I only learned recently that nitrate continued to be used in motion pictures until the 1950s, which was a lot later than I thought. I believe early home movie film, 16mm and 8mm, was safety film from the outset, but was this the case for consumer still film also?