ting u isher ▁was ▁best ▁su ited ▁to ▁saving ▁an ▁art work . ▁Der ix ▁is ▁also ▁thought ▁to ▁have ▁assist ed ▁Martin ▁in ▁his ▁publications ▁on ▁conservation ▁and ▁rest oration . ▁In ▁his ▁continu ation ▁of ▁the ▁H als ▁project ▁at ▁H aar lem , ▁he ▁brought ▁in ▁the ▁chem ist ▁G osen ▁Van ▁der ▁S le en ▁to ▁aid ▁in ▁his ▁analysis . ▁This ▁was ▁the ▁first ▁known ▁case ▁in ▁the ▁Netherlands ▁of ▁a ▁chem ist ▁advis ing ▁on ▁a ▁painting ▁rest oration ▁project . ▁With ▁Van ▁der ▁S le en ' s ▁appro val , ▁he ▁continued ▁the ▁rest oration ▁as ▁planned , ▁working ▁with ▁his ▁son ▁A . M ., ▁nep hew ▁C . ▁F . ▁Louis , ▁and ▁brother ▁Care l ▁to ▁re - var n ish ▁the ▁paint ings . ▁Although ▁he ▁published ▁little ▁himself , ▁save ▁for ▁an ▁article ▁in ▁the ▁Kurt ▁Walter ▁Bach st itz ▁Gallery ▁Bul letin , ▁he ▁remained ▁well - occup ied ▁with ▁his ▁rest oration ▁business ▁in ▁the ▁H ague ▁until ▁his ▁death ▁on ▁December ▁ 4 , ▁ 1 9 3 2 . ▁ ▁A . ▁Martin ▁de ▁Wild ▁ ▁An gen it us ▁Martin ▁de ▁Wild , ▁known ▁as ▁A . ▁M . ▁or ▁Martin , ▁was ▁Der ix ▁de ▁Wild ' s ▁son . ▁He ▁sought ▁to ▁further ▁the ▁chemical ▁approach ▁to ▁rest oration ▁promoted ▁by ▁his ▁father ▁and ▁uncle . ▁To ▁this ▁end , ▁he ▁en rolled ▁at ▁the ▁Del ft ▁University ▁of ▁Technology , ▁comple ting