Decarboxylation problems

[PipM]

I have made chocolate three times now. Each time I do so, the end product improves but I still don't think that I have got the carboxylation process right as the potency of the chocolate is very mild. I am using 240F for 45 minutes, but the weed does not change colour although it does become crumbly.

How can I tell when it is properly decarboxylated?

 

[voltage]

it should be a toasty brown color.
I use an infrared thermometer to make sure I'm at 240 for ~40

 

[PipM]

it should be a toasty brown color.
I use an infrared thermometer to make sure I'm at 240 for ~40

Thanks, voltage, if it’s not a toasty brown colour, do you suggest I cook it longer even at 240?