To be clear, I wasn't "recommending" Graham's Beer Engine particularly ... I mean, I use it and like its simplicity, but it is already quite dated and with Graham's passing is very unlikely to be further developed


My main point was just that there are different ways of calculating predictions of beer colour, and sometimes the numbers they derive can be very different ... most of the time, as brewers who have chosen our preferred recipe calculators, it doesn't matter. By the time we've used our recipe calculator a few times, and made beer with the recipes we've formulated, we've got an idea for what the number colours mean, and we can formulate recipes to make beers lighter or darker than other beers we've made, accordingly ... most of the time, it doesn't matter if I (or Anspach and Hobday, for that matter



Anyway, you have all the details I used to formulate that recipe ... so you could, put it as is (complete with the darker grains that you don't have and the 75% efficiency that may be much lower than you achieve with your GF) into your "chosen" calculator, say the GF one, and see what number that predicts for that recipe (call that number X) ... then you can adjust the recipe for the grains you have, and the efficiency you achieve, and tweak the proportions to get the colour you want again (around about X)

Cheers, PhilB