Melt the remaining 100g of chocolate, stirring constantly, in a Bain Marie (a heat-proof bowl placed over a pan of barely simmering water, without the water touching the bowl). Once melted, remove the bowl from the heat and add half of the remaining chocolate, stirring it in until melted. Then keep stirring until the mixture cools down to around 45°C. Add the remaining chocolate and keep stirring again until you reach 27°C. At this temperature, dark chocolate begins to solidify and it should feel a little thicker and glossier. At this point, you want to place the bowl back over the pan for just 30 seconds to warm up the bottom of the bowl, thereby keeping the chocolate smooth and liquid. Make sure not to exceed 32°C though, as the crystals would begin to separate and you’d need to temper the batch again (careful, the bowl will continue to carry over the heat, so warm it up for just 30 seconds and check the temperature before warming it any more).