The picture shows my hand testing the consistency of a bowl of plaster in readiness for pouring into the mold of my most recent sculpture. Because plaster sets within minutes I sometimes add a few grains (and I mean a few) of sodium citrate. This delays the setting time and allows the plaster to find its way into all the nooks and crannies. But if you over do the amount the plaster will take for ever to set. This once happened when I was making a life cast of a model's torso.
It takes a committed model to submit herself to a life cast. Plaster heats up when it sets rapidly. For the model's comfort, I add a tiny amount of sodium citrate to the mix so that it becomes no more than pleasantly warm. But on that one occasion I added too much and after ten minutes the plaster was showing no sign of setting.
Think fast! Here I am with a naked model covered in wet plaster from her neck to her thighs. I can't leave her like that. If she stands up the plaster will run down the rest of her and we'll be in a worse state than ever. I had no option but to scoop it off by the handful and then sponge her down.
And you know what...the brave girl volunteered to try again the next day!
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