It goes against all DW's own recommendations in a forthcoming publication where he advises not to use a solvent in the first developer, thiosulphate or thiocyanate. However the film manufacturers have rather more expertise in the field of Reversal processing, so this a modern modern/current 1st Developer recommend by Filmotec. However it's remarkably similar to ID-62 (used 1+1) + Thiocyanate (instead of Thiosulphate), plus additional bromide instead of Benzotriazole.