When u make ur butter added about an equal amount of water. After straining allow all liquid to cool in fridge - 6 hours at least then use a butter knife to poke 3holes at the opposite edged to allow the water to drain. Run knife along the edge and drop out the butter puck. Turn it to the side that was against the water and scrape off the brown crap. Neither the water nore that brown sh!t u want. It tastes like complete sh!t. Use butter as u wish.
I literally just did this. I tend to do it as needed per recipe. I only infuse the amount of butter I need for that recipe. I do this because I need a massive dose. For example I infused a quarter cup with 9 and 1/2 g today. I boil about a cup of water then I drop whatever butter I need into the water and then I let it simmer for about an hour and a half to 2 hours. Works great sometimes and depending on the flower I used works much better than RSO.